GitlabHelper.get_group_members_added_by_user_id bugfix
Ensure that GitlabHelper.get_group_members_added_by_user_id() doesn't crash for group users that don't have a created_by field (which means that the user created the group).
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Ensure that GitlabHelper.get_group_members_added_by_user_id() doesn't crash for group users that don't have a created_by field (which means that the user created the group).