Additional error checking on user record deletion

modules/userinfo.py

@@ -115,7 +115,10 @@ def delUser(name, channel,  nick, user):
     p.srem(namespace, nick)
     if channels == {channel.encode()}:
         p.delete(chanspace)
+        if user:
             p.srem(gnamespace, user)
+        else:
+            warn("Attempt to delete nonexistent user: %s" % user)
     else:
         p.srem(chanspace, channel)
     p.execute()