ENGCOM-1785: [Backport 2.2] Fix minor issues in ui export converter classes #15694

Author: Stanislav Idolov

app/code/Magento/Ui/Model/Export/ConvertToCsv.php

@@ -6,6 +6,7 @@
 namespace Magento\Ui\Model\Export;
 
 use Magento\Framework\App\Filesystem\DirectoryList;
+use Magento\Framework\Exception\FileSystemException;
 use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\Filesystem;
 use Magento\Framework\Filesystem\Directory\WriteInterface;
@@ -31,11 +32,17 @@ class ConvertToCsv
      */
     protected $pageSize = null;
 
+    /**
+     * @var Filter
+     */
+    protected $filter;
+
     /**
      * @param Filesystem $filesystem
      * @param Filter $filter
      * @param MetadataProvider $metadataProvider
      * @param int $pageSize
+     * @throws FileSystemException
      */
     public function __construct(
         Filesystem $filesystem,

app/code/Magento/Ui/Model/Export/ConvertToXml.php

@@ -10,6 +10,7 @@
 use Magento\Framework\App\Filesystem\DirectoryList;
 use Magento\Framework\Convert\Excel;
 use Magento\Framework\Convert\ExcelFactory;
+use Magento\Framework\Exception\FileSystemException;
 use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\Filesystem;
 use Magento\Framework\Filesystem\Directory\WriteInterface;
@@ -50,12 +51,18 @@ class ConvertToXml
      */
     protected $fields;
 
+    /**
+     * @var Filter
+     */
+    protected $filter;
+
     /**
      * @param Filesystem $filesystem
      * @param Filter $filter
      * @param MetadataProvider $metadataProvider
      * @param ExcelFactory $excelFactory
      * @param SearchResultIteratorFactory $iteratorFactory
+     * @throws FileSystemException
      */
     public function __construct(
         Filesystem $filesystem,
@@ -88,6 +95,7 @@ protected function getOptions()
      * Returns DB fields list
      *
      * @return array
+     * @throws LocalizedException
      */
     protected function getFields()
     {
@@ -103,6 +111,7 @@ protected function getFields()
      *
      * @param DocumentInterface $document
      * @return array
+     * @throws LocalizedException
      */
     public function getRowData(DocumentInterface $document)
     {