[twitter] improve 480bc34e

only check for double user assignment where necessary

gallery_dl/extractor/twitter.py

@@ -370,7 +370,6 @@ class TwitterExtractor(Extractor):
         return udata
 
     def _assign_user(self, user):
-        if self._user_obj is None:
         self._user_obj = user
         self._user = self._transform_user(user)
 
@@ -906,6 +905,7 @@ Your reaction.""",
         for tweet in self.api.tweet_detail(tweet_id):
             if tweet["rest_id"] == tweet_id or \
                     tweet.get("_retweet_id_str") == tweet_id:
+                if self._user_obj is None:
                     self._assign_user(tweet["core"]["user_results"]["result"])
                 tweets.append(tweet)