Adjustment to meet Vaadin 8.14.1's newer Jsoup dependency#31

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mpetris wants to merge 10 commits intovaadin:masterfrom

Commits on Dec 14, 2018

bugfix: in the case of a LeafNode calling childNodes throws an Exception, therefore check childNodeSize first
mpetris
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access to index 2 fails for elements with no children and no attributes because array size is 2 then conaining only tagname and element id
mpetris
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Commits on Dec 19, 2018

added tests to check changes for parsing DOM leafs without attributes and adding LeafNode work
mpetris
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Commits on May 19, 2022