Keep current selection for Related, Up-sells, Cross-sells, Associated grids (#2715)

Author: luigifab

app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php

@@ -406,7 +406,7 @@ public function relatedGridAction()
         $this->_initProduct();
         $this->loadLayout();
         $this->getLayout()->getBlock('catalog.product.edit.tab.related')
-            ->setProductsRelated($this->getRequest()->getPost('products_related', null));
+            ->setProductsRelated($this->getRequest()->getPost('products_related', []));
         $this->renderLayout();
     }
 
@@ -419,7 +419,7 @@ public function upsellGridAction()
         $this->_initProduct();
         $this->loadLayout();
         $this->getLayout()->getBlock('catalog.product.edit.tab.upsell')
-            ->setProductsRelated($this->getRequest()->getPost('products_upsell', null));
+            ->setProductsUpsell($this->getRequest()->getPost('products_upsell', []));
         $this->renderLayout();
     }
 
@@ -432,7 +432,7 @@ public function crosssellGridAction()
         $this->_initProduct();
         $this->loadLayout();
         $this->getLayout()->getBlock('catalog.product.edit.tab.crosssell')
-            ->setProductsRelated($this->getRequest()->getPost('products_crosssell', null));
+            ->setProductsCrossSell($this->getRequest()->getPost('products_crosssell', []));
         $this->renderLayout();
     }
 
@@ -445,7 +445,7 @@ public function superGroupAction()
         $this->_initProduct();
         $this->loadLayout();
         $this->getLayout()->getBlock('catalog.product.edit.tab.super.group')
-            ->setProductsGrouped($this->getRequest()->getPost('products_grouped', null));
+            ->setProductsGrouped($this->getRequest()->getPost('products_grouped', []));
         $this->renderLayout();
     }