Noissue - Remove unnecessary references to undefined

lib/filterStorage.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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 748 matching lines @@
           case "filter":
           case "subscription":
             this.wantObj = true;
             this.curObj = {};
             break;
           case "subscription filters":
             this.wantObj = false;
             this.curObj = [];
             break;
           default:
-            this.wantObj = undefined;
+            this.wantObj = null;
             this.curObj = null;
         }
       }
       else if (this.wantObj === false && val)
         this.curObj.push(val.replace(/\\\[/g, "["));
     }
     finally
     {
       Filter.knownFilters = origKnownFilters;
       Subscription.knownSubscriptions = origKnownSubscriptions;
     }
   }
 };