DevTools: Simplify mergeOrIntersect

Source/devtools/front_end/FileSystemProjectDelegate.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 205 matching lines @@
     /**
      * @param {!Array.<string>} queries
      * @param {!Array.<string>} fileQueries
      * @param {boolean} caseSensitive
      * @param {boolean} isRegex
      * @param {!WebInspector.Progress} progress
      * @param {function(!Array.<string>)} callback
      */
     findFilesMatchingSearchRequest: function(queries, fileQueries, caseSensitive, isRegex, progress, callback)
     {
-        var result = [];
+        var result = null;
         var queriesToRun = queries.slice();
         if (!queriesToRun.length)
             queriesToRun.push("");
         progress.setTotalWork(queriesToRun.length);
         searchNextQuery.call(this);
 
         /**
          * @this {WebInspector.FileSystemProjectDelegate}
          */
         function searchNextQuery()
@@ skipping 287 matching lines @@
      */
     _removeFile: function(path)
     {
         this.dispatchEventToListeners(WebInspector.ProjectDelegate.Events.FileRemoved, path);
     },
 
     reset: function()
     {
         this.dispatchEventToListeners(WebInspector.ProjectDelegate.Events.Reset, null);
     },
-    
+
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @type {!WebInspector.FileSystemProjectDelegate}
  */
 WebInspector.fileSystemProjectDelegate;
 
 /**
  * @constructor
@@ skipping 53 matching lines @@
     {
         var projectId = WebInspector.FileSystemProjectDelegate.projectId(fileSystemPath);
         return this._projectDelegates[projectId];
     }
 }
 
 /**
  * @type {!WebInspector.FileSystemWorkspaceProvider}
  */
 WebInspector.fileSystemWorkspaceProvider;