clear empty import pages
clear empty import pages

include cases when AlkamidBot cleared imported words because they had
been added normaly (not through the import pages) (https://pl.wiktionary.org/w/index.php?title=Wikipedysta%3AAlkamidBot%2Fsjp%2Fwszystkie%2F1&type=revision&diff=4783306&oldid=4750167)

alkamid/wiktionary,alkamid/wiktionary