From acdc41bd0323d05894d53467e4933f62dbf5c70b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 28 Jul 2021 13:39:15 +0530
Subject: [PATCH] Allow sending no payload

---
 kittens/tui/images.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kittens/tui/images.py b/kittens/tui/images.py
index bfddf6c2c..c50eab234 100644
--- a/kittens/tui/images.py
+++ b/kittens/tui/images.py
@@ -621,7 +621,10 @@ class GraphicsCommand:
             defval: Union[str, None, int] = getattr(GraphicsCommand, k)
             setattr(self, k, defval)
 
-    def iter_transmission_chunks(self, data: bytes, level: int = -1, compression_threshold: int = 1024) -> Iterator[bytes]:
+    def iter_transmission_chunks(self, data: Optional[bytes] = None, level: int = -1, compression_threshold: int = 1024) -> Iterator[bytes]:
+        if data is None:
+            yield self.serialize()
+            return
         gc = self.clone()
         gc.S = len(data)
         if level and len(data) >= compression_threshold: