Bid Console: Don't show show "Sort By: Affinity Score" if there are no scores

[enrubio]

Currently even if affinity scores have not computed for a venue, we still show that they have the option to sort by scores. We should check this and not display this option if there are no scores.

[xkopenreview]

currently it check for the reviewers_affinity_score_id value in domain content

i think maybe the field should be removed if there's no affinity_score invitation or the scores are not computed yet

1. affinity score won't be computed - the invitation should not be created and the reviewers_affinity_score_id value is invalid so it should be removed
2. affinity score is not computed yet - bid process should not start because there's no affinity scores yet