`assert` used in code flow

Summary

While looking in the origin of issue #58 (closed) , I found that assert is used in the code for flow control options:

https://gitlab.cta-observatory.org/cta-computing/dpps/calibrationpipeline/calibpipe/-/blob/main/calibpipe/atmosphere/molecular_atmosphere_calibrator.py#L350

assert should only be used for testing and/or debugging purposes, because assert checks can be turned off. See https://realpython.com/python-assert-statement/#understanding-common-pitfalls-of-assert