return empty array instead of None when no hashtags found

delojza.py

@@ -230,7 +230,7 @@ class DelojzaBot:
             for i, hashtag in enumerate(hashtags):
                 if "PRAS" in hashtag:
                     hashtags[i] = "PRAS"
-            return hashtags
+        return hashtags
 
     def get_hashtags(self, message):
         hashtags = self.extract_hashtags(message)