MC-15574: Fix associated product grid

Author: svitja

app/code/Magento/ConfigurableProduct/Block/Adminhtml/Product/Edit/Tab/Variations/Config/Matrix.php

@@ -98,6 +98,8 @@ public function __construct(
     }
 
     /**
+     * Return currency symbol.
+     *
      * @return string
      */
     public function getCurrencySymbol()
@@ -274,6 +276,8 @@ public function getImageUploadUrl()
     }
 
     /**
+     * Return product qty.
+     *
      * @param Product $product
      * @return float
      */
@@ -283,6 +287,8 @@ public function getProductStockQty(Product $product)
     }
 
     /**
+     * Return variation wizard.
+     *
      * @param array $initData
      * @return string
      */
@@ -298,6 +304,8 @@ public function getVariationWizard($initData)
     }
 
     /**
+     * Return product configuration matrix.
+     *
      * @return array|null
      */
     public function getProductMatrix()
@@ -309,17 +317,22 @@ public function getProductMatrix()
     }
 
     /**
+     * Return product attributes.
+     *
      * @return array|null
      */
     public function getProductAttributes()
     {
         if ($this->productAttributes === null) {
             $this->prepareVariations();
         }
+
         return $this->productAttributes;
     }
 
     /**
+     * Prepare product variations.
+     *
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      * @return void
      * TODO: move to class