Backport of cmd/hcl2_upgrade: Fix crash when variables block is undefined into release/1.8.x #12257
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Backport
This PR is auto-generated from #12250 to be assessed for backporting due to the inclusion of the label backport/1.8.x.
The below text is copied from the body of the original PR.
This change fixes a crash that occurs when trying to add undeclared variables into an empty
variables map. The variables block when defined will always be non-nil but in the case
where variables are declared and initialized from a legacy JSON variables file the map
must be initialized first.
Closes #12199