plugin identity: fixed nick when there is no user part in entity

sat/plugins/plugin_misc_identity.py

@@ -90,7 +90,12 @@ class Identity(object):
         else:
             #  and finally then vcard
             nick = yield self._v.getNick(client, jid_)
-            id_data[u"nick"] = nick if nick else jid_.user.capitalize()
+            if nick:
+                id_data[u"nick"] = nick
+            elif jid_.user:
+                id_data[u"nick"] = jid_.user.capitalize()
+            else:
+                id_data[u"nick"] = jid_.userhost()
 
         try:
             avatar_path = id_data[u"avatar"] = yield self._v.getAvatar(