Only expose Geometry name when it is set.

[Waguramu]

Currently, when Geometry name is not set, it is still exposed in JSON as an empty string - this should not be the case:

{
    "areaId": "TheBestArea",
    "geometry":
    {
        "geometries":
        [
            {
                "coordinates":
                [
                    [
                        41.0,
                        10.0,
                        0.0
                    ],
                    [
                        43.0,
                        11.0,
                        0.0
                    ]
                ],
                "name": "",
                "type": "LineString"
            },
            {
                "coordinates":
                [
                    [
                        41.5,
                        10.5,
                        0.0
                    ]
                ],
                "name": "",
                "type": "MultiPoint"
            },
            {
                "coordinates":
                [
                    [
                        41.5,
                        10.5,
                        0.0
                    ],
                    [
                        41.600000001490116,
                        10.700000002980232,
                        0.0
                    ]
                ],
                "name": "",
                "type": "MultiPoint"
            },
            {
                "coordinates":
                [
                    [
                        41.5,
                        10.5,
                        0.0
                    ],
                    [
                        41.600000001490116,
                        10.700000002980232,
                        0.0
                    ]
                ],
                "name": "",
                "type": "LineString"
            },
            {
                "coordinates":
                [
                    [
                        [
                            [
                                41.5,
                                10.5,
                                0.0
                            ],
                            [
                                41.5,
                                10.299999997019768,
                                0.0
                            ],
                            [
                                41.600000001490116,
                                10.700000002980232,
                                0.0
                            ],
                            [
                                41.5,
                                10.5,
                                0.0
                            ]
                        ]
                    ]
                ],
                "name": "",
                "type": "MultiPolygon"
            },
            {
                "coordinates":
                [
                    [
                        [
                            41.5,
                            10.5,
                            0.0
                        ],
                        [
                            41.600000001490116,
                            10.700000002980232,
                            0.0
                        ],
                        [
                            41.5,
                            10.299999997019768,
                            0.0
                        ],
                        [
                            41.80000001192093,
                            10.900000005960464,
                            0.0
                        ],
                        [
                            41.5,
                            10.5,
                            0.0
                        ]
                    ]
                ],
                "name": "",
                "type": "Polygon"
            },
            {
                "coordinates":
                [
                    [
                        [
                            0.0,
                            1.0,
                            0.0
                        ],
                        [
                            0.0,
                            0.0,
                            0.0
                        ],
                        [
                            1.0,
                            0.0,
                            0.0
                        ],
                        [
                            1.0,
                            1.0,
                            0.0
                        ],
                        [
                            0.0,
                            1.0,
                            0.0
                        ]
                    ]
                ],
                "name": "",
                "type": "Polygon"
            },
            {
                "coordinates":
                [
                    [
                        [
                            1.0,
                            0.0,
                            0.0
                        ],
                        [
                            2.0,
                            0.0,
                            0.0
                        ],
                        [
                            2.0,
                            1.0,
                            0.0
                        ],
                        [
                            1.0,
                            1.0,
                            0.0
                        ],
                        [
                            1.0,
                            0.0,
                            0.0
                        ]
                    ]
                ],
                "name": "",
                "type": "Polygon"
            },
            {
                "coordinates":
                [
                    [
                        [
                            2.0,
                            1.0,
                            0.0
                        ],
                        [
                            3.0,
                            1.0,
                            1.0
                        ],
                        [
                            3.0,
                            0.0,
                            2.0
                        ],
                        [
                            2.0,
                            0.0,
                            3.0
                        ],
                        [
                            2.0,
                            1.0,
                            0.0
                        ]
                    ]
                ],
                "name": "",
                "type": "Polygon"
            },
            {
                "coordinates":
                [
                    [
                        [
                            [
                                3.0,
                                0.0,
                                0.0
                            ],
                            [
                                4.0,
                                0.0,
                                0.0
                            ],
                            [
                                4.0,
                                1.0,
                                0.0
                            ],
                            [
                                3.0,
                                0.0,
                                0.0
                            ]
                        ]
                    ],
                    [
                        [
                            [
                                4.0,
                                1.0,
                                0.0
                            ],
                            [
                                3.0,
                                0.0,
                                0.0
                            ],
                            [
                                3.0,
                                1.0,
                                0.0
                            ],
                            [
                                4.0,
                                1.0,
                                0.0
                            ]
                        ]
                    ]
                ],
                "name": "",
                "type": "MultiPolygon"
            }
        ],
        "type": "GeometryCollection"
    },
    "id": "Way.TheBestArea.42",
    "layerId": "WayLayer",
    "mapId": "Tropico",
    "properties":
    {
        "layer":
        {
            "cheese":
            {
                "mozzarella":
                {
                    "smell": "neutral",
                    "validity":
                    [
                        {
                            "direction": "POSITIVE"
                        }
                    ]
                }
            }
        },
        "main_ingredient": "Pepper"
    },
    "type": "Feature",
    "typeId": "Way",
    "wayId": 42
}