MAGETWO-37560: Banners are not displayed on Banner Rotator Widget

Author: vpaladiychuk

app/code/Magento/Widget/Block/Adminhtml/Widget/Catalog/Category/Chooser.php

@@ -11,7 +11,6 @@
  */
 namespace Magento\Widget\Block\Adminhtml\Widget\Catalog\Category;
 
-
 class Chooser extends \Magento\Catalog\Block\Adminhtml\Category\Widget\Chooser
 {
     /**

app/code/Magento/Widget/Test/Unit/Block/Adminhtml/Widget/Catalog/Category/ChooserTest.php

@@ -6,7 +6,6 @@
 
 namespace Magento\Widget\Test\Unit\Block\Adminhtml\Widget\Catalog\Category;
 
-
 class ChooserTest extends \PHPUnit_Framework_TestCase
 {
     /**
@@ -119,7 +118,6 @@ public function testGetTreeHasLevelField()
         $this->storeManager->expects($this->once())->method('getGroups')->willReturn($storeGroups);
         $this->storeManager->expects($this->atLeastOnce())->method('getStore')->willReturn($this->store);
 
-
         $this->context->expects($this->once())->method('getStoreManager')->willReturn($this->storeManager);
         $this->context->expects($this->once())->method('getRequest')->willReturn($this->request);
         $this->context->expects($this->once())->method('getEscaper')->willReturn($this->escaper);

app/code/Magento/Widget/Test/Unit/Controller/Adminhtml/Widget/Instance/CategoriesTest.php

@@ -6,7 +6,6 @@
 
 namespace Magento\Widget\Test\Unit\Controller\Adminhtml\Widget\Instance;
 
-
 class CategoriesTest extends \PHPUnit_Framework_TestCase
 {
     /**
@@ -69,7 +68,6 @@ public function setUp()
         $this->resultRaw = $this->getMock('Magento\Framework\Controller\Result\Raw', [], [], '', false);
         $this->resultFactory = $this->getMock('Magento\Framework\Controller\ResultFactory', [], [], '', false);
         $this->context = $this->getMock('Magento\Backend\App\Action\Context', [], [], '', false);
-
     }
 
     public function testExecute()