Send a correctly-formatted response if there are no host options saved.

remoting/webapp/crd/js/options_export.js

Index: remoting/webapp/crd/js/options_export.js
diff --git a/remoting/webapp/crd/js/options_export.js b/remoting/webapp/crd/js/options_export.js
index dbd3a25560c96d3e8fa94fe1fceecc06561bc31e..392b043ee065a1045a777995ba0f2561abfb348f 100644
--- a/remoting/webapp/crd/js/options_export.js
+++ b/remoting/webapp/crd/js/options_export.js
@@ -20,11 +20,17 @@ remoting.OptionsExporter = function() {
 
 remoting.OptionsExporter.migrateSettings_ = function() {
   var result = new base.Deferred();
-  chrome.storage.local.get('remoting-host-options', function(options) {
+  chrome.storage.local.get(KEY_NAME, function(options) {
+    // If there are no host options stored, reformat the message response so
+    // that the sender doesn't interpret it as an error.
+    if (Object.keys(options).length == 0) {
+      options[KEY_NAME] = '{}';
+    }
     result.resolve(options);
   })
   return result.promise();
 };
 
+var KEY_NAME = 'remoting-host-options';
 
 }());