Disambiguate between ongoing production and unknown end date

[dracos]

Perhaps have an 'ongoing' checkbox? Otherwise hard/impossible for the site to tell whether something should be shown in past or current productions. Currently, productions with no end date are shown as past productions, e.g. Wicked at Apollo Victoria: http://theatricalia.com/place/s8/apollo-victoria-london
But on a play page, they're shown as Current: http://theatricalia.com/play/3xa/the-mousetrap
http://theatricalia.com/play/5v6/barnum/production/njr another example.

[rjmunro]

They also seem to be shown as current on a person: http://theatricalia.com/person/43a/maureen-lipman