XML dump of all active courses.

application/modules/courses/models/CourseModel.php

@@ -361,6 +361,10 @@ class Courses_CourseModel extends Unl_Model
 
 	static public function findByCourseCode($subject, $courseNumber, $courseLetter = '')
 	{
+		if (!$courseLetter) {
+			$courseLetter = '';
+		}
+		
 		$db = Zend_Registry::get('db');
 
 		$select = new Zend_Db_Select($db);