Focus After Clear

After clearing the components selected object informations, the input field stay on focus, so if you want to open the objects list you have to focus on another html element and then refocus on the paper-autocomplete 

https://github.com/fluidnext/paper-autocomplete/blob/57e7c5fae40b05fb0e56e47bd59dceac66b3b238/paper-autocomplete.js#L563