ModuleVariables with nested files of multiple block definition fails

[xescugc]

General information:

• Operating System:
• Terracognita version / tag:
• Did you build Terracognita from sources or did you use the Docker image:

Describe the bug:

If you use something like:

azurerm_windows_virtual_machine:
  - os_disk.disk_size_gb

It's never declared as a variable on the module.

Log message

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Additional context

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