Avoid NPE when the default branch cannot be identified

Robin Rosenberg

2013-09-01 02ede7f11c6fb28ca53fc240905cd1b140236f08

 src/main/java/com/gitblit/wicket/pages/ComparePage.java

@@ -103,6 +103,9 @@
            toCommit = getCommit(r, toCommitId.getObject());
         }

         // prepare submodules
         getSubmodules(toCommit);
			
         final String startId = fromCommit.getId().getName();
         final String endId = toCommit.getId().getName();