Fix error removing user from group
Fix error removing user from group


grumbelbart/zotero_dataserver_sualk,zebulon2/dataserver,zebulon2/dataserver,grumbelbart/zotero_dataserver_sualk,zebulon2/dataserver,zebulon2/dataserver,grumbelbart/zotero_dataserver_sualk,grumbelbart/zotero_dataserver_sualk