commander: fix conn

commander.html

@@ -62,13 +62,13 @@
 
       const serverURL = 'ws://10.254.0.1:8080/';
 
-      var conn = None;
+      var conn = false;
 
-      loginEl.addEventListener('click', login)
+      loginEl.addEventListener('click', login);
 
       function login(e)
       {
-         conn.close();
+         if (conn) conn.close();
          conn = new WebSocket(serverURL, ['mbcRcRf']);
          conn.addEventListener('open', onOpen);
          conn.addEventListener('message', onMessage);