Trim chat messages and don't send any empty ones

rust/src/ui/chatbox.rs

@@ -104,6 +104,7 @@ impl ChatBox {
     }
 
     pub fn on_submit(&mut self, message: GString) {
+        let message = message.to_string().trim().to_owned();
         if let Some(line_edit) = &mut self.line_edit {
             line_edit.clear();
             if self.in_game {
@@ -111,6 +112,9 @@ impl ChatBox {
             }
         }
         self.signals().on_closed().emit();
+        if message.is_empty() {
+            return;
+        }
         if let Some(peer) = &mut NetworkManager::singleton().bind_mut().peer {
             match peer {
                 PeerKind::Client(peer, socket_addr) => {