fixed error message if body is undefined

Author: cartok

lib/rest_client.js

@@ -47,7 +47,7 @@ module.exports.RestClient = function (options) {
         } else if (!httpCallSucceeded(response)) {
           reject({
             code: response.statusCode,
-            errorMessage: body.result || response.statusMessage
+            errorMessage: (body || {}).result || response.statusMessage
           });
         }
         resolve(body);