fix another silly mistake in post-poll.py for entries without emoji

post-poll.py

@@ -43,6 +43,8 @@ if len(rows) < 2:
   exit(0)
 
 def media(name, emoji):
+  if emoji is None:
+    return {'text': name}
   emoji_obj = {'id': emoji} if emoji.isascii() and emoji.isdigit() else {'name': emoji}
   return {'text': name, 'emoji': emoji_obj}