Issue #1425774 by sgabe, Fix error in exposed filter, array_filter() -- first argument should be an array in date_select_input_date().

Issue #323852 by tim.plunkett and arlinsandbulte, Dropdowns shouldn't include a blank option when required.

Issue #323852, Validation was broken for unlimited value select widgets with required dates, they were incorrectly getting their end dates cleared out.

Issue #1408014 by dasjo, We no longer need the $error_element value to display errors properly, second follow-up.

Made some fixes to find and test the right entities when checking whether to use default values. More work is needed.

Issue #1422600, Make sure end date cannot cause validation errors when show end date checkbox is not checked.

Issue #1417872, Remove code to compute missing date parts from empty values now that the new validation prevents that from working.

Issue #1417872, Make sure empty year field is validated in the same way other date parts are validated.

Make sure only new entities pick up default values, to avoid resetting an empty value to the current date.

Issue #1017216 by tim.plunkett, arlinsandbulte: Added custom date format without time shows 'all day'.