message: [tests] Return an empty array if nowJson.builds is empty
  * return an empty array if nowJson.builds is empty
  *
  * extracted from PR discussion
  * occur after following change
  * kudos to
  /cc
diff: @@ -64,7 +64,7 @@ async function testDeployment(
  nowJson.build.env.NOW_BUILDER_DEBUG = process.env.NOW_BUILDER_DEBUG;
  }
  - for (const build of nowJson.builds) {
  + for (const build of nowJson.builds || []) {
  if (builderUrl) {
  if (builderUrl === '@canary') {
  build.use = `${build.use}@canary`;
  