Adding a non-existing photo star in MESA doesn't return an error

[rieder]

Describe the bug Adding a photo star in MESA when the file containing the photo does not exist does not return an error, instead it returns a 1 MSun star.

To Reproduce Steps to reproduce the behavior:

stellar_evolution = Mesa(version='15140')
star_in_code = stellar_evolution.photo_stars.add_particle(
    Particle(filename="i_dont_exist")
)

Expected behavior MESA returns an error

[stale[bot]]

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