Bugfix/np constraints

[c-randall]

Description

There was a conditional statement in the _setup() calls to CVODE and IDA that was preventing numpy arrays from being used for the constraints_idx and algebraic_idx options. The conditional now just checks that the option is not None so any array_like can be used, including numpy arrays.

Note: The main branch and recent v1.1.x releases already had this fix implemented, so this is really just a back port to v1.0.x to resolve a user-posted issue.

Fixes #35

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that improves speed/readability/etc.)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• No style issues: $ nox -s linter [-- format]
• Code is free of misspellings: $ nox -s codespell [-- write]
• All tests pass: $ nox -s tests
• Badges are updated: $ nox -s badges

Further checks:

• The documentation builds: $ nox -s docs.
• Code is commented, particularly in hard-to-understand areas.
• Tests are added that prove fix is effective or that feature works.