fix NullPointerException in ITicketService and add TestCase

Kevin Walter

2014-04-14 4868740ed7f40ce0cf162f17a8224856ae10a4b0

 src/main/java/com/gitblit/tickets/ITicketService.java

@@ -714,9 +714,12 @@
      TicketKey key = new TicketKey(repository, ticketId);
      TicketModel ticket = ticketsCache.getIfPresent(key);

      // if ticket not cached
      if (ticket == null) {
         // load & cache ticket
         //load ticket
         ticket = getTicketImpl(repository, ticketId);
         // if ticket exists
         if (ticket != null) {
         if (ticket.hasPatchsets()) {
            Repository r = repositoryManager.getRepository(repository.name);
            try {
@@ -733,7 +736,7 @@
               r.close();
            }
         }
         if (ticket != null) {
            //cache ticket
            ticketsCache.put(key, ticket);
         }
      }