tmdb.org meta data problem

I’ve notice unrated movies are listed as “NR” on tmdb.org, but kodi only accepts “NOT RATED”. Also several titles have a premier release before the theatrical. Looks like common practice on the site is to not put a rating on the premier which causes the scraper to leave the rating blank even though it has one for the theatrical release. Would provide some examples, but I already submitted corrections to all that I found on tmdb so far.