catch send fails

src/textual_web/app_session.py

@@ -281,7 +281,10 @@ class AppSession(Session):
             True if the data was sent, otherwise False.
         """
         stdin = self.stdin
-        stdin.write(self.encode_packet(b"D", data))
+        try:
+            stdin.write(self.encode_packet(b"D", data))
+        except RuntimeError:
+            return False
         await stdin.drain()
         return True
 
@@ -296,6 +299,9 @@ class AppSession(Session):
         """
         stdin = self.stdin
         data_bytes = json.dumps(data).encode("utf-8")
-        stdin.write(self.encode_packet(b"M", data_bytes))
+        try:
+            stdin.write(self.encode_packet(b"M", data_bytes))
+        except RuntimeError:
+            return False
         await stdin.drain()
         return True

src/textual_web/ganglion_client.py

@@ -361,6 +361,7 @@ class GanglionClient(Handlers):
         connector = _ClientConnector(
             self, cast(SessionID, packet.session_id), cast(RouteKey, route_key)
         )
+
         await session_process.start(connector)
 
     async def on_session_close(self, packet: SessionClose) -> None: