MAGETWO-66357: Fix for Product Attribute's Conditions #6400

Author: vrann

app/code/Magento/Rule/Model/Condition/AbstractCondition.php

@@ -441,6 +441,8 @@ public function getValueName()
         }
         if (!empty($valueArr)) {
             $value = implode(', ', $valueArr);
+        } elseif (is_array($value)) {
+            $value = implode(', ', $value);
         }
         return $value;
     }