Don't fail plan if project,region,zone defaults cannot be retrieved #16135
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The DefaultProviderProject, DefaultProviderRegion and DefaultProviderZone funcs set respectively the project, region and zone in a diff if one is provided, unless they fetch the defaults from config. However, at times, these values may not be available during a plan, as they are dynamically computed at apply time.
We should avoid throwing an error if this is the case, but rather set an empty value in the diff.
Resolves #16133