Improved error handling, and improved uid-loading

Requests would sometimes throw an error while retrieving the c_user cookie (If there were multiple cookies with this name)

fbchat/client.py

@@ -157,7 +157,10 @@ class Client(object):
         self.payloadDefault = {}
         self.client_id = hex(int(random()*2147483648))[2:]
         self.start_time = now()
-        self.uid = str(self._session.cookies['c_user'])
+        self.uid = self._session.cookies.get_dict().get('c_user')
+        if self.uid is None:
+            raise Exception('Could not find c_user cookie')
+        self.uid = str(self.uid)
         self.user_channel = "p_" + self.uid
         self.ttstamp = ''
 

fbchat/graphql.py

@@ -143,7 +143,11 @@ def graphql_queries_to_json(*queries):
     return json.dumps(rtn)
 
 def graphql_response_to_json(content):
+    content = strip_to_json(content) # Usually only needed in some error cases
+    try:
         j = json.loads(content, cls=ConcatJSONDecoder)
+    except Exception as e:
+        raise Exception('Error while parsing JSON: {}'.format(repr(content)), e)
 
     rtn = [None]*(len(j))
     for x in j: