--- a/image_class.module
+++ b/image_class.module
@@ -73,12 +73,10 @@ Image Class 7.x-1.0, function image_class_field_attach_view_alter(&$out
     $settings = $display['settings'];
 
     // Return if 'class' setting is not available.
-    if (!isset($settings['class'])) {
-      return;
+    if (isset($settings['class'])) {
+      foreach (element_children($element) as $delta) {
+        $element[$delta]['#item']['attributes']['class'] = $settings['class'];
+      }
     }
-
-    foreach (element_children($element) as $delta) {
-      $element[$delta]['#item']['attributes']['class'] = $settings['class'];
-    }
   }
 }