A group membership can be added without filling in the group

One-sentence description

A group membership can be added without filling in the group.

Current behaviour / Reproducing the bug

  1. Create a group membership for a user but don't fill in a group even though it is bold
  2. breakage

Expected behaviour

  1. Create a group membership for a user but don't fill in a group even though it is bold
  2. a error message that is more helpfull
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