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Fix an incorrect assumption in get_instruments_in_ranking_statistic()

Tito Dal Canton requested to merge tito-canton/gwcelery:fix_instruments_in_rank_for_pycbc into master

The function currently assumes that only detectors with a valid chi^2 field contribute to the ranking of an event. This is not true for PyCBC Live in O3, which can have empty chi^2 values even though all detectors always contribute to the ranking.

This patch fixes the get_instruments_in_ranking_statistic() function to always return all detectors for events from PyCBC Live.

We are testing a change to PyCBC Live which will make this problem important. This is necessary for PyCBC Live to continue working well after that change.

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