Creating a DSR: cannot update non-existent Delivery Service ''

[zrhoffman]

This Bug Report affects these Traffic Control components:

• Traffic Ops
• Traffic Portal

Steps to reproduce:

1. Enable Delivery Service Requests by setting .properties.dsRequests.enabled to true in traffic_portal/app/src/traffic_portal_properties.json
2. Start CDN in a Box for Developers

   docker-compose up

3. Go to https://localhost:444/#!/delivery-services/1?dsType=HTTP
4. Set Display Name to new-display-name
5. Press Update
6. Choose Submit Request for Review and Deployment, enter My text as your comment, and press Submit

Expected behavior:

Traffic Ops successfully created a Delivery Service Request

Actual behavior

POSTing to /api/4.1/deliveryservice_requests responded with status code 400:

{
  "alerts": [
    {
      "text": "cannot update non-existent Delivery Service ''",
      "level": "error"
    }
  ]
}