Added method to find page descriptor from a Uri
Fixed issue with tabs not populating if an icon is expected, but is null
Merge branch 'fix/tab-npe' into develop

* fix/tab-npe:
  Fixed issue with tabs not populating if an icon is expected, but is null
Merge branch 'feature/app-descriptor' into develop

* feature/app-descriptor:
  Added method to find page descriptor from a Uri