fixed a bug that prevented fbchat from returning the list of all users in some accounts

fbchat/client.py

@@ -357,7 +357,11 @@ class Client(object):
         users = []
 
         for k in payload.keys():
-            user = self._adapt_user_in_chat_to_user_model(payload[k])
+            try:
+                user = self._adapt_user_in_chat_to_user_model(payload[k])
+            except KeyError:
+                continue
+
             users.append(User(user))
 
         return users