refs #5983 fix sites manager was broken

plugins/SitesManager/angularjs/sites-manager/api-helper.service.js

@@ -43,7 +43,7 @@
 
         function commaDelimitedFieldToArray (value) {
 
-            if(value === undefined || value === null || value === '')
+            if(!value)
                 return [];
 
             return value.split(',');