provider/azurerm: Fixing a bug in the VM Extension Resource

[tombuildsstuff]

I encountered a scenario where a resource group was deleted via the Portal - but still existed in state. Upon calculating a plan - Terraform throws the following exception:

Error refreshing state: 3 error(s) occurred:

* azurerm_virtual_machine_extension.combined: Error making Read request on Virtual Machine Extension combined: compute.VirtualMachineExtensionsClient#Get: Failure responding to request: StatusCode=404 -- Original Error: autorest/azure: Service returned an error. Status=404 Code="ResourceGroupNotFound" Message="Resource group 'XXX' could not be found."

(duplicate output removed)

Updated so that the resource group not existing causes it to be cleared from state (to match other resources) - need to confirm the acceptance tests are still fine (which I'll do a bit later on) - but this fixes the bug I was seeing.

[pmcatominey]

Looks good pending tests 👍

[stack72]

LGTM! Thank @tombuildsstuff :)

[ghost]

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