fix(channel): allow sending image-only messages without text (#22752)

src/lib/components/channel/MessageInput.svelte

@@ -925,7 +925,7 @@
 														}
 
 														// Submit the content when Enter key is pressed
-														if (content !== '' && e.keyCode === 13 && !e.shiftKey) {
+														if ((content !== '' || files.length > 0) && e.keyCode === 13 && !e.shiftKey) {
 															submitHandler();
 														}
 													}