Avoid NPE when the default branch cannot be identified

Robin Rosenberg

2013-09-01 02ede7f11c6fb28ca53fc240905cd1b140236f08

 src/main/java/com/gitblit/models/UserPreferences.java

@@ -37,6 +37,8 @@

   public final String username;

   public String locale;
	
   private final Map<String, UserRepositoryPreferences> repositoryPreferences = new TreeMap<String, UserRepositoryPreferences>();

   public UserPreferences(String username) {