do not specify one_of if toolchain_constraints is empty

eth-cscs / stackinator

https://eth-cscs.github.io/stackinator/

BSD 3-Clause "New" or "Revised" License

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Closed simonpintarelli closed 4 months ago

simonpintarelli commented 5 months ago

Environments with only a single compiler defined generated spack.yaml contained:

packages:
  require:
  - one_of : []

Which caused concretization errors.

This PR only adds pakcages.require.one_of if toolchain_constraints is not empty.