Fix bad display of group with comma when added as a subgroup

1. create a group with a comma like groupd, (see commaGroupEntry.png)
2. create a group wihtout a comma like basegroup
3. add groupd, as a subgroup of basegroup (see commaGroupAddedBeforeSave.png)
4. the subgroup is correctly displayed as groupd,
5. save basegroup
6. groupd, is displayed as groupd in the sub groups section (see missingComma.png)
7. click Edit (see GroupContainingCommaGroup.png)

Also, when clicking the subgroup inside the group entry (see the red section in missingComma.png) it redirects to an empty page (see EmptyPage.png)