Issue 6305 - Do not nullify storage on engine disposed

libadblockplus-android-settings/src/org/adblockplus/libadblockplus/android/settings/AdblockHelper.java

 /*
  * 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 64 matching lines @@
         Log.w(TAG, "No saved adblock settings");
       }
     }
   };
 
   private final Runnable engineDisposedCallback = new Runnable()
   {
     @Override
     public void run()
     {
-      Log.d(TAG, "Releasing adblock settings storage");
-      storage = null;
+      Log.d(TAG, "Adblock engine disposed");
     }
   };
 
   // singleton
   protected AdblockHelper()
   {
     // prevents instantiation
   }
 
   /**
@@ skipping 103 matching lines @@
 
   /**
    * @deprecated The method is deprecated: use .getProvider().getCounter() instead
    */
   @Deprecated
   public int getCounter()
   {
     return provider.getCounter();
   }
 }