Issue 417 - Reinitializing removed filter lists (Platform)

lib/filesystem/io.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 51 matching lines @@
         listener.process(null);
         callback(null);
       }.bind(this));
       return;
     }
 
     this._getFileEntry(file, false, function(fs, fileEntry)
     {
       fileEntry.file(function(file)
       {
+        if (file.size == 0)
+        {
+          callback("File is empty");
+          return;
+        }
+
         var reader = new FileReader();
         reader.onloadend = function()
         {
           if (reader.error)
             callback(reader.error);
           else
           {
             var lines = reader.result.split(/[\r\n]+/);
             for (var i = 0; i < lines.length; i++)
               listener.process(lines[i]);
@@ skipping 116 matching lines @@
             exists: true,
             isDirectory: fileEntry.isDirectory,
             isFile: fileEntry.isFile,
             lastModified: metadata.modificationTime.getTime()
           });
         }, callback);
       }, callback);
     }.bind(this));
   }
 };