Fix typechecks and tests

client/src/telethon/_impl/client/events/filters/callback.py

@@ -20,4 +20,4 @@ class Data(Combinable):
 
     def __call__(self, event: Event) -> bool:
         data = getattr(event, "data", None)
-        return self._data == data if data is not None else False
+        return self._data == data if isinstance(data, bytes) else False

client/src/telethon/_impl/client/events/queries.py

@@ -79,9 +79,7 @@ class ButtonCallback(Event):
         """
 
         pid = peer_id(self._raw.peer)
-        chat = self._chat_map.get(pid)
-        if not chat:
-            chat = await self._client._resolve_to_packed(pid)
+        chat = self._chat_map.get(pid) or await self._client._resolve_to_packed(pid)
 
         lst = CherryPickedList(self._client, chat, [])
         lst._ids.append(

client/src/telethon/_impl/client/types/message.py

@@ -497,7 +497,7 @@ class Message(metaclass=NoPublicConstructor):
         else:
             return False
 
-    def __bool__(self):
+    def __bool__(self) -> bool:
         return not isinstance(self._raw, types.MessageEmpty)