def action(self, taskers, period, source, sourceField, **kw):
        if source is not None:
            period = source[sourceField]
        for tasker in taskers:
            if period is not None:
                tasker.period = max(0.0, period)
            tasker.desire = RUN
            console.profuse( "Bid run {0} at (1)\n".format(tasker.name, tasker.period))

        return None
locale_html must still work if field is None.
dataset/ETHPy150Open ioflo/ioflo/ioflo/base/wanting.py/WantRun.action--crossover with--dataset/ETHPy150Open mozilla/addons-server/src/olympia/translations/tests/test_helpers.py/test_empty_locale_html