ENH: add NaN guardrails for hyp0f1

[fbourgey]

Reference issue

What does this implement/fix?

Add NaN guardrails for hyp0f1 after scipy/scipy#25467 is failing

Additional information

AI Generation Disclosure

No AI

[fbourgey]

Thanks Daniel.

[dschmitz89]

@fbourgey : I think it makes sense to have a generic solution for this that works for all functions to avoid repetition. What do you think about a small helper function that simply returns Nan if any input Parameter is Nan?

[fbourgey]

@fbourgey : I think it makes sense to have a generic solution for this that works for all functions to avoid repetition. What do you think about a small helper function that simply returns Nan if any input Parameter is Nan?

Sounds like a good idea.