Fixes findbugs warning - dereferencing null in exception case

Simon Harrer

2013-07-18 fbe265fa787e4be9cb63c6bae2ef30b9400d9afc

 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) {