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RAVEN log messages when GRB FAR is higher than threshold are unclear

In the log messages for https://gracedb.ligo.org/superevents/S230813at/view/ we see only that the joint candidate was not published due to the GRB candidate not being astrophysical:

Screenshot_2023-08-14_at_9.08.39_AM

This is rather unclear since this due to the fact that GRB FAR is higher than the specified threshold, leading to the joint FAR being negative (see the calculation here: https://ligo-raven.readthedocs.io/en/latest/joint_far.html#targeted-search-method).

We need to make the log messages more clear and add a condition that prevents negative joint FARs from going out.

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