Skip nag_dfols tests when DFO-LS is not installed

[Swayam-maurya]

This PR skips the nag_dfols optimizer tests when the optional DFO-LS dependency
is not available.

Without this guard, pytest fails during test collection when DFO-LS is not
installed locally. The change makes the test suite robust to optional optimizer
dependencies, consistent with how other optimizers are handled.

[janosg]

Hi @Swayam-maurya, thanks a lot for the PR! yes, this is something we want. Could you change it to use @pytest.mark.skipif instead of using pytest.skip inside an if condition? This makes it more aligned with the rest of optimagic. You can find an example here:

optimagic/tests/optimagic/optimizers/test_gfo_optimizers.py

Line 65 in 54ca1bd

@pytest.mark.skipif(

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[Swayam-maurya]

Thanks for the suggestion!..
I’ve updated the test to use pytest.mark.skipif for the optional DFO-LS dependency and verified locally that all optimizer tests pass.

[janosg]

Thanks! This is ready to merge. I'll investigate the failing docs build; It's unrelated to your changes!

[Swayam-maurya]

Thanks a lot! Appreciate you looking into the docs build.

[Swayam-maurya]

Hi @janosg ...Thanks again for merging the PR.
I’m looking for another small, well-scoped issue to work on.
Is there something you’d recommend ?