outline.el fix for bug#7619.
It turns out the use of nil in the :type of outline regexp was for very hysterical raisons. Prior to 2001-09-12T20:42:08Zfirstname.lastname@example.org, the default value was nil, then it was initialized afterwards. Everywhere in the code assumes it cannot be nil, so no need to allow that any more. * lisp/outline.el (outline-regexp): No longer allow nil. (outline-heading-end-regexp): Add safety predicate.
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