azurerm_key_vault_managed_hardware_security_module_role_assignment - fix nil panic in error message

[jackofallops]

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Description

nil dereference fix

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Changes to existing Resource / Data Source

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Change Log

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• azurerm_resource - support for the thing1 property [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #0000

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[manicminer]

LGTM 👍

[github-actions]

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