CC-3590: Calendar GUI->DJ user should not be able to invoke "Add Show" window

- done

airtime_mvc/public/js/airtime/schedule/full-calendar-functions.js

@@ -212,8 +212,10 @@ function viewDisplay( view ) {
     }
 
     if(($("#add-show-form").length == 1) && ($("#add-show-form").css('display')=='none') && ($('.fc-header-left > span').length == 5)) {
+        if($.trim($("#add-show-form").html()) != ""){
             makeAddShowButton();
         }
+    }
     
     //save view name to db
     var url = '/Schedule/set-time-scale/format/json';