Fix NPE when there are two repositories which only differ in case

Sascha Vogt

2014-06-18 396e9bb50d7eca0d96da2c5fc5177a22f78d30b7

 src/main/java/com/gitblit/auth/PAMAuthProvider.java

@@ -98,7 +98,9 @@
         logger.error(e.getMessage());
         return null;
      } finally {
         pam.dispose();
         if (pam != null) {
            pam.dispose();
         }
      }

        UserModel user = userManager.getUserModel(username);