Fix model dictionary interface when no cheb coefficients

Starfish-develop / Starfish

Tools for Flexible Spectroscopic Inference

https://starfish.readthedocs.io/en/latest/

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

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Fix model dictionary interface when no cheb coefficients #143

Closed mileslucas closed 3 years ago

mileslucas commented 3 years ago

Fixes #142

Preivously chebyshev coefficients were being added into the param dictionary even if they weren't present at instantiation, showing up in the params as an empty list. This PR protects that from happening with an if statement and adds a regression test.