fix

@@ -125,10 +125,16 @@ var chat = {
             })
             .on('keydown.chat.sendText', '.text-in', function(event) {
                 if (event.which === 13) {
+                    let val = $.trim(event.target.value);
+
+                    if (!val) {
+                        return ;
+                    }
+
                     let content = {
                         avatar: userAvatar,
                         data: {
-                            content: $.trim(event.target.value)
+                            content: val
                         }
                     };