Issue 2376 - Implement custom filters in new options page

options.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 417 matching lines @@
       delete document.body.dataset.dialog;
     }, false);
 
     // Advanced tab
     var filterTextbox = document.querySelector("#custom-filters-add input");
     placeholderValue = ext.i18n.getMessage("options_customFilters_textbox_placeholder");
     filterTextbox.setAttribute("placeholder", placeholderValue);
     function addCustomFilters()
     {
       var filterText = filterTextbox.value;
-      if (!filterText)
-        return;
-
       ext.backgroundPage.sendMessage(
       {
         type: "filters.add",
         text: filterText
       });
       filterTextbox.value = "";
     }
     E("custom-filters-add").addEventListener("submit", function(e)
     {
       e.preventDefault();
@@ skipping 280 matching lines @@
     filter: ["added", "loaded", "removed"]
   });
   ext.backgroundPage.sendMessage(
   {
     type: "subscriptions.listen",
     filter: ["added", "disabled", "homepage", "removed", "title"]
   });
 
   window.addEventListener("DOMContentLoaded", onDOMLoaded, false);
 })();