Months ago I edited all the entries in three different keywords to merge them into a single one in order to avoid having duplicate entries. All my editions were accepted, but the two keywords that I wanted to delete and that now have zero entries continue to appear when you search for them, besides the duplication, this also means that at any given time someone else may add the empty keywords to a new title and have titles that should be listed together in separate pages.
The three keywords that need merging are:
Arlington National Cemetery, with 37 entries: http://www.imdb.com/search/keyword?keywords=arlington-national-cemetery
Arlington Cemetery http://www.imdb.com/search/keyword?keywords=arlington-cemetery and Arlington Cemetary http://www.imdb.com/search/keyword?keywords=arlington-cemetary, both with zero entries after my edition from months ago.