Fix crash when calling getMsg with no options.

chrome/browser/resources/chromeos/chromevox/common/braille_util.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview A utility class for general braille functionality.
  */
 
 
 goog.provide('cvox.BrailleUtil');
@@ skipping 174 matching lines @@
  * Gets the braille state of a node.
  * @param {Node} node The node.
  * @return {string} The string representation.
  */
 cvox.BrailleUtil.getState = function(node) {
   if (!node) {
     return '';
   }
   return cvox.NodeStateUtil.expand(
       cvox.DomUtil.getStateMsgs(node, true).map(function(state) {
-          if (cvox.ChromeVox.msgs.getMsg(state[0] + '_brl')) {
+          // Check to see if a variant of the message with '_brl' exists,
+          // and use it if so.
+          //
+          // Note: many messages are templatized, and if we don't pass any
+          // argument to substitute, getMsg might throw an error if the
+          // resulting string is empty. To avoid this, we pass a dummy
+          // substitution string array here.
+          var dummySubs = ['dummy', 'dummy', 'dummy'];
+          if (cvox.ChromeVox.msgs.getMsg(state[0] + '_brl', dummySubs)) {
             state[0] += '_brl';
           }
           return state;
       }));
 };
 
 
 /**
  * Gets the braille container role of a node.
  * @param {Node} prev The previous node in navigation.
@@ skipping 200 matching lines @@
  * @param {number} number The number to clamp.
  * @param {number} min The minimum value to return.
  * @param {number} max The maximum value to return.
  * @return {number} {@code number} if it is within the bounds, or the nearest
  *     number within the bounds otherwise.
  * @private
  */
 cvox.BrailleUtil.clamp_ = function(number, min, max) {
   return Math.min(Math.max(number, min), max);
 };