Nil check for IsSync

[nmvk]

Issue #, if available:
aws-controllers-k8s/community#1231

Description of changes:
Nil check fix for IsSync needed for MemoryDB and
Fixed a compare ignore bug.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[a-hilaly]

Lookgs good! thanks @nmvk

[vijtrip2]

Thanks for quick fix.

Would this handle multi-level nil check?

Ex: ko.Status.FieldA.SubFieldB should have nil check for both FieldA and SubFieldB

[a-hilaly]

@vijtrip2 the generated code is fine for nested fields. It looks like the issue is only with top level fields

	if r.ko.Spec.ProvisionedThroughput == nil {
		return false, nil
	}
	if r.ko.Spec.ProvisionedThroughput.ReadCapacityUnits == nil {
		return false, nil
	}
	provisionedThroughputCandidates := []int{0, 10}
	if !ackutil.InStrings(*r.ko.Spec.ProvisionedThroughput.ReadCapacityUnits, provisionedThroughputCandidates) {
		return false, nil
	}

[vijtrip2]

/lgtm

[ack-bot]

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This pull-request has been approved by: nmvk, vijtrip2

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