MAGETWO-57165: [Backport] 'Add Products Manually' link is not available after removing all variations #2703 - for 2.0

Author: OlgaVasyltsun

app/code/Magento/Eav/Model/AttributeRepository.php

@@ -103,7 +103,7 @@ public function getList($entityTypeCode, \Magento\Framework\Api\SearchCriteriaIn
             'main_table.entity_type_id = entity_type.entity_type_id',
             []
         );
-        $attributeCollection->join(
+        $attributeCollection->joinLeft(
             ['eav_entity_attribute' => $attributeCollection->getTable('eav_entity_attribute')],
             'main_table.attribute_id = eav_entity_attribute.attribute_id',
             []

lib/internal/Magento/Framework/Model/ResourceModel/Db/Collection/AbstractCollection.php

@@ -520,6 +520,33 @@ public function join($table, $cond, $cols = '*')
         return $this;
     }
 
+    /**
+     * Join table to collection select
+     *
+     * @param string $table
+     * @param string $cond
+     * @param string $cols
+     * @return $this
+     */
+    public function joinLeft($table, $cond, $cols = '*')
+    {
+        if (is_array($table)) {
+            foreach ($table as $k => $v) {
+                $alias = $k;
+                $table = $v;
+                break;
+            }
+        } else {
+            $alias = $table;
+        }
+
+        if (!isset($this->_joinedTables[$alias])) {
+            $this->getSelect()->joinLeft([$alias => $this->getTable($table)], $cond, $cols);
+            $this->_joinedTables[$alias] = true;
+        }
+        return $this;
+    }
+
     /**
      * Redeclare before load method for adding event
      *