[release-2.11] MTV-4413 | Skip context-dependent validations when maps are missing

[github-actions]

Backport: #4725

Issue:
When a NetworkMap or StorageMap referenced by a Plan is deleted, validateNetworkMap/validateStorageMap correctly set Critical conditions but plancontext.New() then fails because Referenced.Map is nil. This hard error prevents updatePlanStatus() from ever being called, so the conditions are never persisted and the controller fails.

Fix:
Add an early return in validate() after map validations when blocker conditions are already present. This lets the reconcile flow continue, reconcile will also check HasBlockerCondition() and skips execution, and the user sees a "not ready" status on the Plan instead of controller crash.

Example:

Create a plan and delete the network map:

oc mtv create plan plan-rhel9 -S vmware-provider  --vms Ameen-win2022
oc delete networkmap plan-rhel9-network-map

Without fix:

oc logs -n openshift-mtv deployments/forklift-controller | jq 'select(.level == "error")'
Defaulted container "main" out of: main, inventory
{
  "level": "error",
  "ts": "2026-02-09 09:50:57.989",
  "logger": "plan|ds9qd",
  "msg": "Reconcile failed.",
  "plan": {
    "name": "plan-rhel9",
    "namespace": "demo"
  },
  "error": "Not enough data to build plan context.",
  "stacktrace": "github.com/kubev2v/forklift/pkg/controller/base.(*Reconciler).Ended
\t/app/pkg/controller/base/controller.go:64
github.com/kubev2v/forklift/pkg/controller/plan.Reconciler.Reconcile.func1
\t/app/pkg/controller/plan/controller.go:177
github.com/kubev2v/forklift/pkg/controller/plan.Reconciler.Reconcile
\t/app/pkg/controller/plan/controller.go:234
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Reconcile
\t/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:119
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler
\t/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:334
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem
\t/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:294
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.2
\t/app/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:255"
}

with fix:

oc logs -n openshift-mtv deployments/forklift-controller | jq 'select(.level == "error")'
Defaulted container "main" out of: main, inventory

Ref: https://issues.redhat.com/browse/MTV-4413
Resolves: MTV-4413

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud