fix #1397 -- fix sitemap regeneration

This is a fix for #1397.  Bug introduced in #1032 (32f4c0d).

(hat tip to `git bisect`)

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
apparently, directories don’t work in file_dep

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Merge pull request #1419 from getnikola/fix-sitemaps

fix #1397 -- fix sitemap regeneration