ACP2E-3735: Incorrect filtered Data in Product Export for Multi-Store Setup

- fixed unit test

Author: o-rykh

app/code/Magento/CatalogImportExport/Model/Export/Product.php

@@ -1008,6 +1008,9 @@ public function export()
             $this->paginateCollection($page, $this->getItemsPerPage());
 
             $exportData = $this->getExportData();
+            if (count($exportData) == 0) {
+                break;
+            }
             if ($page == 1) {
                 $writer->setHeaderCols($this->_getHeaderColumns());
             }

app/code/Magento/CatalogImportExport/Test/Unit/Model/Export/ProductTest.php

@@ -373,8 +373,6 @@ public function testExportCurPageEqualToLastBreakInternalCalls()
         $this->product->expects($this->once())->method('paginateCollection')->with($page, $itemsPerPage);
         $this->abstractCollection->expects($this->once())->method('setOrder')->with('entity_id', 'asc');
 
-        $this->abstractCollection->expects($this->once())->method('count')->willReturn(1);
-
         $this->abstractCollection->expects($this->once())->method('getCurPage')->willReturn($curPage);
         $this->abstractCollection->expects($this->once())->method('getLastPageNumber')->willReturn($lastPage);
         $headers = ['headers'];