If getDaemonVersion() fails then log that the host version is not available.

remoting/webapp/host_controller.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @constructor */
 remoting.HostController = function() {
   /** @type {remoting.HostPlugin} @private */
   this.plugin_ = remoting.HostSession.createPlugin();
   /** @type {HTMLElement} @private */
   this.container_ = document.getElementById('daemon-plugin-container');
   this.container_.appendChild(this.plugin_);
   /** @type {remoting.Host?} */
   this.localHost = null;
   /** @param {string} version */
   var printVersion = function(version) {
     if (version == '') {
       console.log('Host not installed.');
     } else {
       console.log('Host version:', version);
     }
   };
-  this.plugin_.getDaemonVersion(printVersion);
+  try {
+    this.plugin_.getDaemonVersion(printVersion);
+  } catch (err) {
+    console.log('Host version not available.');

[Jamie, 2012/05/18 01:13:35]

Optional: I think I'd just call printVersion('')

+  }
 };
 
 // Note that the values in the enums below are copied from
 // daemon_controller.h and must be kept in sync.
 /** @enum {number} */
 remoting.HostController.State = {
   NOT_IMPLEMENTED: -1,
   NOT_INSTALLED: 0,
   INSTALLING: 1,
   STOPPED: 2,
@@ skipping 319 matching lines @@
   try {
     this.plugin_.getDaemonConfig(onConfig);
   } catch (err) {
     this.setHost(null);
     onDone();
   }
 };
 
 /** @type {remoting.HostController} */
 remoting.hostController = null;