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# Cancel accepts cleared instruction fields

A cancel through `PATCH /dd/v1/deliveries/{external_delivery_id}` no longer
fails when the body also carries an instruction field set to `null` or an
empty string.

## What changed

* **`PATCH /dd/v1/deliveries/{external_delivery_id}`** cancels the delivery
  when `status` is `CANCELLED` and any `pickup_instructions` or
  `dropoff_instructions` key present is `null` or an empty string. Those keys
  are ignored; a cancel never edits instructions.
* An instruction field with any value other than `null` or an empty string
  next to `status` is still refused with `400`, and `status` still accepts
  only `CANCELLED`.

## Migration

No action is required. Clients that send `null` for every empty note can
cancel without stripping those keys first.