Make OpenAPIGetter tolerant of nil

Kubernetes-commit: 0da29848c538813bba8f9aa2e23542456105caa8

Author: Jefftree

pkg/cmd/apply/patcher.go

@@ -156,7 +156,7 @@ func (p *Patcher) patchSimple(obj runtime.Object, modified []byte, namespace, na
 }
 }
 
-if patch == nil {
+if patch == nil && p.OpenAPIGetter != nil {
 if openAPISchema, err := p.OpenAPIGetter.OpenAPISchema(); err == nil && openAPISchema != nil {
 // if openapischema is used, we'll try to get required patch type for this GVK from Open API.
 // if it fails or could not find any patch type, fall back to baked-in patch type determination.