* lisp/ox-publish.el (org-publish-get-base-files): Ensure MATCH regexp
is always a string since `directory-files-recursively' requires it.
* testing/lisp/test-ox-publish.el (test-org-publish/get-project-from-filename):
Add test.
Suggested-by: Jens Lechtenboerger <lechten@wi.uni-muenster.de>
<http://lists.gnu.org/archive/html/emacs-orgmode/2017-09/msg00528.html>
* lisp/ox-publish.el (org-publish-get-base-files): Make sure to remove
directories.
* testing/examples/pub/file.txt:
* testing/examples/pub/noextension: New files.
* testing/lisp/test-ox-publish.el (test-org-publish/base-extension):
New test.
