title: iOS Google Drive SDK - Query string for folders doesn't appear to be working
body: <p>Per GTLQueryDrive.h method documentation:</p>
  
  <pre><code>// Method: drive.files.list
  // Lists the user's files.
  //  Optional:
  //   q: Query string for searching files.
  // Fetches a GTLDriveFileList.
  + (id)queryForFilesList;
  </code></pre>
  
  <p>Also here: <a href="https://developers.google.com/drive/search-parameters" rel="nofollow">https://developers.google.com/drive/search-parameters</a> 
  Second item under the Examples heading:</p>
  
  <pre><code>Search for folders using the folder-specific MIME type
  mimeType = 'application/vnd.google-apps.folder'
  </code></pre>
  
  <p>When I perform a <code>queryForFilesList</code> and set <code>q</code>, I get a non-error result but the contents of the GTLFileList only has two properties set, <code>kind</code> and <code>etag</code>. There is nothing else returned in the results.  See below:</p>
  
  <pre><code>GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];
  
  query.q = @"mimeType='application/vnd.google-apps.folder'";
  
  [self.fileChecker executeQuery:query completionHandler:^(GTLServiceTicket *ticket, id object, NSError *error) {
  
      if (!error) {
          //I see this in the console...
          //No Errors in Folder Query: 
          //GTLDriveFileList 0x108f3430: {kind:"drive#fileList" 
          //etag:""Q5ElJByAJoL0etObruYVPRipH1k/vyGp6PvFo4RvsFtPoIWeCReyIC8""}
          NSLog(@"No Errors in Folder Query: %@",object);
  
          GTLDriveFileList *list = (GTLDriveFileList *)object;
  
          //So, none of this for() loop happens
          for (GTLDriveFile *file in list.items) {
              NSLog(@"Folder: \n \n %@ \n \n",file);  
          }
      } else {
          NSLog(@"Folder Query Error: %@",error);
      }
  }];
  </code></pre>
  
  <p>Anything I'm doing wrong? The iOS Google Drive app can definitely find a list of Folders. What am I doing wrong?</p>