gator: null initContainers combined with securityContext MustNotExist pathTest triggers error: mismatch between path entry (type: List) and received object (type: <nil>).

[zmedico]

What steps did you take and what happened:
With gator a null initContainers combined with securityContext MustNotExist pathTest triggers this error:

$ gator expand < <(yq -c . expansion-templates.yaml; yq -c . tetrisdefaultsecuritycontext-init.yaml; yq -c . cilium-dnsproxy_daemonset.yaml)
error expanding resources: error expanding resource cilium-dnsproxy: failed to mutate resultant resource cilium-dnsproxy-pod: mutation caaa4af9-4739-476a-9d3b-052fa2de87d9 for mutator Assign.mutations.gatekeeper.sh /tetrisdefaultsecuritycontext-init failed for Pod kube-system cilium-dnsproxy-pod: mismatch between path entry (type: List) and received object (type: ). Path: [name: *]

gator-yaml-input.zip

This is the mutation which interacts badly with the null initContainers (also included in the attached zip file):

---
apiVersion: mutations.gatekeeper.sh/v1
kind: Assign
metadata:
  name: tetrisdefaultsecuritycontext-init
spec:
  applyTo:
  - groups:
    - ""
    kinds:
    - Pod
    versions:
    - v1
  location: spec.initContainers[name:*].securityContext
  parameters:
    assign:
      value:
        allowPrivilegeEscalation: false
        capabilities:
          drop:
          - all
        privileged: false
        runAsNonRoot: true
        seccompProfile:
          type: RuntimeDefault
    pathTests:
    - condition: MustNotExist
      subPath: spec.initContainers[name:*].securityContext

What did you expect to happen:
Maybe it could behave as though the initContainers is missing when it is set to null.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Gatekeeper version: v3.16.3
• Kubernetes version: (use kubectl version): v1.28.10

[stale]

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