fix: allow passing an empty string in edit_message_text

Author: KurimuzonAkuma

pyrogram/methods/messages/edit_message_text.py

@@ -124,11 +124,11 @@ async def edit_message_text(
         input_rich_message = None
         entities = None
 
-        if text:
+        if text is not None:
             message, entities = (
                 await utils.parse_text_entities(self, text, parse_mode, entities)
             ).values()
-        elif rich_message:
+        elif rich_message is not None:
             input_rich_message = rich_message.write()
         else:
             raise ValueError("Either text or rich_message must be specified")