WDW History nut
Morocco is for religious beliefs.Yes the Morocco pavilion does not "participate" in the show due to the fact some of the buildings represented have religious significance. Norway is also dark during the show to add a sense of balance. That's the longstanding story I've always heard. Is it true, I don't know.
Norway is because the pavilion wasn't complete when the lighting package was overhauled in 1987/8. And it's not been added in 29 years.