default error code to 500 if not present

Author: Andrew Maillet

lib/errors/oauth-error.js

@@ -13,6 +13,12 @@ var statuses = require('statuses');
 function OAuthError(messageOrError, properties) {
   var message = messageOrError instanceof Error ? messageOrError.message : messageOrError;
   var error = messageOrError instanceof Error ? messageOrError : null;
+  if (_.isEmpty(properties))
+  {
+    properties = {};
+  }
+
+  _.defaults(properties, { code: 500 });
 
   if (error) {
     properties.inner = error;