variable create_global_resources should not have a default value

[tcarrondo]

If not present on the module declaration, and with default false, some resources are easily skipped.

[jdaMachado]

Bool values implicitly always default to false. Changing the default to null does not give the desired result. However, @tcarrondo , do you think this could be a solution if var.create_global_resources == null ?

[tcarrondo]

maybe... worth to try.