Backport of don't panic with a null list block value in config into v1.3 #32457
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Backport
This PR is auto-generated from #32428 to be assessed for backporting due to the inclusion of the label 1.3-backport.
The below text is copied from the body of the original PR.
Using ignore_changes with a list block, where the provider returned an invalid null value for that block, can result in a panic when validating the plan.
Future releases may prevent providers from storing a null block in state, however we can avoid the panic for now. Only the NestingList case needs to be handled, because legacy providers only have list and set blocks, and the set case does not use the config value.
The null case should be avoided entirely by #32424, but this is a minimal backport to patch a crash in the current minor release, and handle pre-existing state with null values.
Fixes #31536