MD User Manager: Changes to 'import supervised users' dialog.

chrome/browser/resources/md_user_manager/create_profile.js

 // Copyright 2016 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 'create-profile' is a page that contains controls for creating
  * a (optionally supervised) profile, including choosing a name, and an avatar.
  */
 
 /** @typedef {{url: string, label:string}} */
@@ skipping 248 matching lines @@
       var signedInUser = this.signedInUser_(this.signedInUserIndex_);
       this.hideMessage_();
       this.loadingSupervisedUsers_ = true;
       this.browserProxy_.getExistingSupervisedUsers(signedInUser.profilePath)
           .then(this.createProfileIfValidSupervisedUser_.bind(this),
                 this.handleMessage_.bind(this));
     }
   },
 
   /**
-   * Displays the import supervised user popup.
+   * Displays the import supervised user popup or an error message if there are
+   * no existing supervised users.
    * @param {!Array<!SupervisedUser>} supervisedUsers The list of existing
    *     supervised users.
    * @private
    */
   showImportSupervisedUserPopup_: function(supervisedUsers) {
     this.loadingSupervisedUsers_ = false;
-    this.$.importUserPopup.show(this.signedInUser_(this.signedInUserIndex_),
-                                supervisedUsers);
+    if (supervisedUsers.length > 0) {
+      this.$.importUserPopup.show(this.signedInUser_(this.signedInUserIndex_),
+                                  supervisedUsers);
+    } else {
+      this.handleMessage_(this.i18n('noSupervisedUserImportText'));
+    }
   },
 
   /**
    * Checks if the entered name matches name of an existing supervised user.
    * If yes, the user is prompted to import the existing supervised user.
    * If no, the new supervised profile gets created.
    * @param {!Array<!SupervisedUser>} supervisedUsers The list of existing
    *     supervised users.
    * @private
    */
@@ skipping 215 matching lines @@
    * Computed binding that returns True if there are any signed-in users.
    * @param {!Array<!SignedInUser>} signedInUsers signed-in users.
    * @return {boolean}
    * @private
    */
   isSignedIn_: function(signedInUsers) {
     return signedInUsers.length > 0;
   }
 });
 }());