FIX: $empty is not an array

This might be a documentation issue, but I couldn't figure out how to define the empty string as an array, so disabling for now.

code/AdvancedDropdownField.php

@@ -25,7 +25,7 @@ public function Field($properties = array()) {
 			$empty = $this->getEmptyString();
 			$options[] = new ArrayData(array(
 				'Value' => '',
-				'Title' => $empty['Title'],
+				'Title' => $empty,
 				'Selected' => $selected,
 				'Disabled' => $disabled,
 				'Attributes' => $this->createOptionAttributes($empty)