Fixed issue with grouped product name column renderer. It

was not rendering correctly when the real product type was
downloadable (see Issue #4815).

app/code/Magento/GroupedProduct/Block/Adminhtml/Items/Column/Name/Grouped.php

@@ -9,6 +9,8 @@
 
 class Grouped extends \Magento\Sales\Block\Adminhtml\Items\Column\Name
 {
+    const COLUMN_NAME = 'name';
+
     /**
      * Prepare item html
      *
@@ -24,8 +26,13 @@ protected function _toHtml()
             $item = $this->getItem();
         }
         if ($productType = $item->getRealProductType()) {
-            $renderer = $this->getRenderedBlock()->getColumnHtml($this->getItem(), $productType);
-            return $renderer;
+            $renderer = $this->getRenderedBlock()->getColumnRenderer(self::COLUMN_NAME, $productType);
+            if ($renderer) {
+                $renderer->setItem($item);
+                $renderer->setField(self::COLUMN_NAME);
+                return $renderer->toHtml();
+            }   
+            return ' ';
         }
         return parent::_toHtml();
     }