easyJet
BRS too has some gaps in July and August. Last month the local newspaper there published an article about easyJet and BRS in which the airline's UK commercial manager is quoted as saying that new BRS routes will be announced in the New Year.
On that basis it is reasonable to speculate that those other 'easyJet airports' that currently also have gaps, including NCL, will see them plugged in some way before the season begins.