Display of calendar entries on the calendar fails if there is an entry with null start date

In order to test, you can try to install Full calendar version 2.0.3 with meeting application version 1.6 or 1.5.6 create a new meeting and then try to look at the meeting calendar view. In the meeting application, the Meeting template by default has null start date and the presence of this entry causes all the meetings to fail being displayed.

• if the full calendar macro is used with a duration parameter, then the JSONService will fail with a velocity exception and thus will not provide any results to the js
• if the full calendar macro is used with an end date parameter (added by FULLCAL-29) then the JSONService will return results properly, but the js displaying them on the calendar will fail (and items would still not be displayed on the calendar)

Note that this is a regression introduced by the refactoring of the JSONService for FULLCAL-29 , before this refactoring all entries that had a null start date were excluded from the results list.