Add catch to `projectGroups` endpoint

The following discussion from !53781 (merged) should be addressed:

• @nicolasdular started a discussion: (+1 comment)

  Question: Anything in an error case that we can or need to handle?

Possible solution

.catch(() => {
        flash(__('Something went wrong while fetching projects'));
        if (callback) {
          callback();
        }
      });

OR

catch(callback);