#540798 by kjy07 and Jody Lynn: Require image style names.

modules/image/image.admin.inc

@@ -55,6 +55,7 @@ function image_style_form(&$form_state, $style) {
     '#default_value' => $style['name'],
     '#description' => t('The name is used in URLs for generated images. Use only lowercase alphanumeric characters, underscores (_), and hyphens (-).'),
     '#element_validate' => array('image_style_name_validate'),
+    '#required' => TRUE,
   );
 
   // Build the list of existing image effects for this image style.
@@ -196,6 +197,7 @@ function image_style_add_form(&$form_state) {
     '#default_value' => '',
     '#description' => t('The name is used in URLs for generated images. Use only lowercase alphanumeric characters, underscores (_), and hyphens (-).'),
     '#element_validate' => array('image_style_name_validate'),
+    '#required' => TRUE,
   );
 
   $form['submit'] = array(