fix: handle errors that don't have a response (#214)

Author: Nathan Friend

lib/verify.js

@@ -59,9 +59,9 @@ module.exports = async (pluginConfig, context) => {
         errors.push(getError('EGLNOPERMISSION', {repoId}));
       }
     } catch (error) {
-      if (error.response.statusCode === 401) {
+      if (error.response && error.response.statusCode === 401) {
         errors.push(getError('EINVALIDGLTOKEN', {repoId}));
-      } else if (error.response.statusCode === 404) {
+      } else if (error.response && error.response.statusCode === 404) {
         errors.push(getError('EMISSINGREPO', {repoId}));
       } else {
         throw error;