ox-html: Do not generate empty validation link
* lisp/ox-html.el (org-html--build-pre/postamble): Do not generate empty validation link. Reported-by: Nick Dokos <ndokos@gmail.com> <http://lists.gnu.org/r/emacs-orgmode/2019-05/msg00153.html>
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@ -1998,8 +1998,9 @@ communication channel."
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(plist-get info :html-metadata-timestamp-format))))
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(when (plist-get info :with-creator)
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(format "<p class=\"creator\">%s</p>\n" creator))
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(format "<p class=\"validation\">%s</p>\n"
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validation-link))))
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(when (org-string-nw-p validation-link)
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(format "<p class=\"validation\">%s</p>\n"
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validation-link)))))
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(t
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(let ((formats (plist-get info (if (eq type 'preamble)
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:html-preamble-format
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