fix Docker build status invalid response data bug (#8392)

closes #6235

services/docker/docker-cloud-build.service.js

@@ -1,4 +1,4 @@
-import { BaseJsonService } from '../index.js'
+import { BaseJsonService, NotFound } from '../index.js'
 import { dockerBlue, buildDockerUrl } from './docker-helpers.js'
 import { fetchBuild } from './docker-cloud-common-fetch.js'
 
@@ -31,6 +31,12 @@ export default class DockerCloudBuild extends BaseJsonService {
 
   async handle({ user, repo }) {
     const data = await fetchBuild(this, { user, repo })
+
+    if (data.objects.length === 0) {
+      throw new NotFound({
+        prettyMessage: `automated builds not set up`,
+      })
+    }
     return this.constructor.render({ state: data.objects[0].state })
   }
 }