can not patch empty values

[kvokka]

if I leave the build section empty for further addition in the profiles with patches, like:

apiVersion: skaffold/v2alpha1
kind: Config
build:
  artifacts: []
deploy:
  helm:
    releases: []

and then apply any profile:

profiles:
- name: pubsub_emulator
  patches:
  - op: add
    path: /build/artifacts/-
    value:
      image: us.gcr.io/replay-gaming/pubsub-emulator
      docker:
        dockerfile: support/skaffold/pubsub_emulator/Dockerfile
  - op: add
    path: /deploy/kubectl/manifests/-
    value: support/skaffold/pubsub_emulator/k8s.yaml

Expected behavior

no error

Actual behavior

I can not use patches

$ skaffold build -p api
FATA[0000] creating runner: applying profiles: applying profile api: invalid path: /build

Information

• Skaffold version: version 1.1.0
• Operating system: MacOs 10.15.2

Connect #3277

[nkubala]

hey @kvokka, thanks for the issue. I debugged this very issue in relation to #2741 earlier today, check out my response there for details on this one. I'll close this as a dupe, you can keep tracking there.