Fix vault factory call.

Author: chenkins

hub/src/main/java/ch/iterate/hub/protocols/s3/S3AutoLoadVaultSession.java

@@ -81,7 +81,7 @@ public void login(final LoginCallback prompt, final CancelCallback cancel) throw
             log.debug("Attempting to locate vault in {}", home);
             final UvfMetadataPayload vaultMetadata = new VaultServiceImpl(backend).getVaultMetadataJWE(
                     UUID.fromString(host.getUuid()), new UserKeysServiceImpl(backend).getUserKeys(backend.getHost(), FirstLoginDeviceSetupCallbackFactory.get()));
-            final Vault vault = VaultFactory.get(home, vaultMetadata.toJSON(), null, null);
+            final Vault vault = VaultFactory.get(home, vaultMetadata.toJSON(), "", new byte[0]);
             vault.load(this, new DisabledPasswordCallback());
             backend.close();
         }