Fix a bug triggered by batch-publishing.
* lisp/muse-publish.el (muse-detect-invalid-style): Remove, since the
right algorithm turned out to be simpler than I had thought. Thanks to
Sergei V. Fleytin for reporting breakage with the old method.
(muse-publish-file): Don't be overzealous when checking for an invalid
style -- use a simpler check.
(muse-batch-publish-files): Don't check for invalid styles here, since
we already do so in `muse-publish-file'.
git-archimport-id: mwolson@gnu.org--2006/muse--main--1.0--patch-80