Showing elements in OntologyBrowser widget with no childrens
Merge branch 'feature/xtags-review' of github.com:XIMDEX/ximdex into feature/xtags-review

* 'feature/xtags-review' of github.com:XIMDEX/ximdex:
  Fixes document tag list cannot be persisted with no tags
  Fixes new tags to be added in other tab taglist when there are more than one tags tab opened
  Fixes tags input widget to be instantiate twice in the same action
  Recovered RelTagsDescriptions files