Empty message null pointer bugfix

src/domain/message.py

@@ -24,7 +24,7 @@ class Message(AbstractEntity):
         """
         Returns True if the message has text.
         """
-        return self.message.text.strip() != ''
+        return self.message.text is not None and self.message.text.strip() != ''
 
     def is_sticker(self):
         """

src/handler/message_handler.py

@@ -59,6 +59,8 @@ class MessageHandler(ParentHandler):
 
         if should_answer:
             text = self.reply_generator.generate(message)
+            if text is None:
+                return
             reply_id = None if not message.is_reply_to_bot() else message.message.message_id
 
             logging.debug("[Chat %s %s answer/reply] %s" %

src/service/reply_generator.py

@@ -27,10 +27,10 @@ class ReplyGenerator:
         words = self.tokenizer.extract_words(message)
         pairs = [trigram[:-1] for trigram in self.tokenizer.split_to_trigrams(words)]
         messages = [self.__generate_best_message(chat_id=message.chat_id, pair=pair) for pair in pairs]
-        longest_message = max(messages, key=len) if len(messages) else ''
+        longest_message = max(messages, key=len) if len(messages) else None
 
         if longest_message and strings_has_equal_letters(longest_message, ''.join(words)):
-            return ''
+            return None
 
         return longest_message