Fix display of 0xx level courses, and 0 hour activities.

application/modules/courses/models/CourseModel.php

@@ -1567,7 +1567,7 @@ class Courses_CourseModel extends Unl_Model
 		$homeCourseCode = array(
 		    'type'         => 'home listing',
             'subject'      => $subject,
-            'courseNumber' => $courseNumber,
+            'courseNumber' => Zend_Filter_Int::filter($courseNumber),
 		    'courseLetter' => $courseLetter
 		);
 
@@ -1691,7 +1691,7 @@ class Courses_CourseModel extends Unl_Model
         $newCrosslisting = array(
             'type'         => $type,
             'subject'      => $subject,
-            'courseNumber' => $courseNumber,
+            'courseNumber' => Zend_Filter_Int::filter($courseNumber),
             'courseLetter' => $courseLetter
         );
         $this->_data['crosslistings'][$lowestId] = $newCrosslisting;
@@ -1709,7 +1709,7 @@ class Courses_CourseModel extends Unl_Model
 
         $this->_data['crosslistings'][$id]['type'] = $type;
         $this->_data['crosslistings'][$id]['subject'] = $subject;
-        $this->_data['crosslistings'][$id]['courseNumber'] = $courseNumber;
+        $this->_data['crosslistings'][$id]['courseNumber'] = Zend_Filter_Int::filter($courseNumber);
         $this->_data['crosslistings'][$id]['courseLetter'] = $courseLetter;
     }
 
@@ -1932,7 +1932,7 @@ class Courses_CourseModel extends Unl_Model
         $activityListing = array();
         foreach($this->_data['activities'] as $activity) {
             $newActivityListing = $activity['type'];
-            if($activity['hours'] != '' && $activity['hours'] != '0') {
+            if($activity['hours'] != '') {
                 $newActivityListing .= ' ' . $activity['hours'];
             }
             $activityId = $activityMap[$activity['type']];
@@ -1968,6 +1968,10 @@ class Courses_CourseModel extends Unl_Model
 
     public function setActivity($type, $hours = null)
     {
+    	if ($hours == '') {
+    		$hours = null; 
+    	}
+    	
     	$found = false;
         foreach ($this->_data['activities'] as $id => $activity) {
         	if ($activity['type'] == $type) {