Fix 2 possible NullPointer occurences

marco

2015-10-17 1aec17636d8c548257cb307f8cc1e41354e00421

 src/main/java/com/gitblit/transport/ssh/UsernamePasswordAuthenticator.java

@@ -51,7 +51,7 @@
      }

      username = username.toLowerCase(Locale.US);
      UserModel user = authManager.authenticate(username, password.toCharArray());
      UserModel user = authManager.authenticate(username, password.toCharArray(), null);
      if (user != null) {
         client.setUser(user);
         return true;