CC-3704: No default checked day when creating repeat show

better validation of user input

airtime_mvc/public/js/airtime/dashboard/helperfunctions.js

@@ -24,6 +24,10 @@ function getDateFromString(time){
     var month = parseInt(date[1], 10) -1;
     var day = parseInt(date[2], 10);
     
+    if (isNaN(year) || isNaN(month) || isNaN(day)){
+        return null;
+    }
+    
     return new Date(year, month, day);
     
 }