Underflow on scores computation
*Created by: njoyard* Pgsql representativescores throws DataError: underflow on https://lqdn.memopol.eu/legislature/representative/ with the following settings: - decay = 1 / 10 - exponent = 1 - decimals = 0 (See http://s.yourlabs.org/sentry/lqdn/issues/3774/)
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