8.x 1.x

src/Plugin/BusinessRulesItemPluginBase.php

@@ -165,7 +165,7 @@ abstract class BusinessRulesItemPluginBase extends PluginBase implements Busines
           }
         }
         elseif (empty($variable->getValue())) {
-          $content = str_replace('{{' . $variable->getId() . '}}', 'NULL', $content);
+          $content = str_replace('{{' . $variable->getId() . '}}', '', $content);
         }
       }
     }