On list elements of `org-publish-project-alist' with :base-extension any
`org-publish-get-project-from-filename' fails with error
(wrong-type-argument sequencep any). This is due to the `concat' call in
`org-publish-get-project-from-filename' where it attempts to construct a
regex by concatenating several strings together. When extension `x' is
any (a symbol), this step fails.

Regards,
Arun Isaac.