org-publish-cache-get-file-property errors out

[reza]

Hello Orgers

I am not sure if it is a bug, but when I call

  (org-publish-find-title "/absolute/path/to/org/file.org" '(""))

I get an error "Wrong type argument: hash-table-p, nil", I assume from
the snippet

  (gethash (cons filename property) org-publish-transient-cache)

in the funtion org-publish-cache-get-file-property where
org-publish-transient-cache is initialized with nil.

Best, Reza