Don't crash with an NPE when the cache contains removed repositoried

Robin Rosenberg

2013-09-01 86dca9da11d66aba2104ab64fbe3affb5ebf0ff4

 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) {