findGroupByName searches only two levels deep

[pfirpfel]

Steps to reproduce

1. Go to the demo

2. Search for "Unterhaltung" (loisirs in french) and try to add the sub theme:

Response from fulltext search:

Expected

Theme gets added

Actual result

Nothing happens

[pfirpfel]

After some debugging I discovered, that "Unterhaltung" is a child of a child. gmf.Themes.findGroupByName, which will be called to retrieve the group by name, only checks the first level of children.

[fredj]

with master, no error in the console but nothing happens

[fredj]

fixed with #3052