when_values edge case

[robdmc]

performing a when_values() filter on a non-shown value results in non-match

Here is example code. removing time_group_config_pk makes filter result in non-match

            ###############################################################
            bb = BB()
            bb.when_context(in_test__in='first', doing='decrement')
            #bb.when_context(in_test__in=['initial', 'first'])
            bb.when_values(
                entity_pk='hard_worker',
                time_group_config_pk='week',
                metric_config_pk='Activity Score',
                #time='12/17/2014',
                time__gte='12/15/2014',
                time__lte='12/21/2014',
            )
            #bb.view_context('in_test', 'doing')
            bb.show(
                rec,
                'time', 'delta','benchmark',
                score_delta=score_delta,
                expected_score_delta=expected_score_delta,
                reduced_benchmark=reduced_benchmark,
                time_group_config_pk=agg_time_group_config.pk
            )
            ###############################################################