Issue #2968835 by joelstein: "Undefined index: description" with drush

imageapi_optimize.drush.inc

@@ -16,9 +16,7 @@ function imageapi_optimize_drush_command() {
       'imageapi_optimize',
     ),
     'arguments' => array(
-      'path' => array(
-        dt('The path of a single image or directory of images to optimize.'),
-      ),
+      'path' => dt('The path of a single image or directory of images to optimize.'),
     ),
     'required-arguments' => TRUE,
     'options' => array(