prevent say nothing

Author: wj-Mcat

src/wechaty/user/contact.py

@@ -202,6 +202,10 @@ async def say(self, message: Union[str, Message, FileBox, Contact, UrlLink]
         say something
         :param message: message content
         """
+        if not message:
+            log.error('can"t say nothing')
+            return None
+
         if not self.is_ready():
             await self.ready()
 

src/wechaty/user/message.py

@@ -111,7 +111,7 @@ def __str__(self) -> str:
         return ''.join(message_list)
 
     async def say(self, msg: Union[str, Contact, FileBox, UrlLink, MiniProgram],
-                  mention_ids: Optional[List[str]] = None) -> Message:
+                  mention_ids: Optional[List[str]] = None) -> Optional[Message]:
         """
         send the message to the conversation envrioment which is source of this message.
 
@@ -125,6 +125,10 @@ async def say(self, msg: Union[str, Contact, FileBox, UrlLink, MiniProgram],
         """
         log.info('say() <%s>', msg)
 
+        if not msg:
+            log.error('can"t say nothing')
+            return None
+
         room = self.room()
         if room is not None:
             conversation_id = room.room_id

src/wechaty/user/room.py

@@ -259,6 +259,10 @@ async def say(self,
         """
         log.info('Room say <%s, %s>', some_thing, mention_ids)
 
+        if not some_thing:
+            log.error('can"t say nothing')
+            return None
+
         # we should import UrlLink type locally because of circular dependency
 
         from wechaty.user.url_link import UrlLink