Fix caption being "None" when passing None (pyrogram#879)

SpEcHiDe · web-flow · commit 4af9e30cfd6f · 2022-01-29T11:13:09.000+01:00
diff --git a/pyrogram/parser/parser.py b/pyrogram/parser/parser.py
@@ -31,7 +31,7 @@ def __init__(self, client: Optional["pyrogram.Client"]):
         self.markdown = Markdown(client)
 
     async def parse(self, text: str, mode: Optional[str] = object):
-        text = str(text).strip()
+        text = str(text if text else "").strip()
 
         if mode == object:
             if self.client:
