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Use LIBXML_NOEMPTYTAG to avoid creating self-closing <a> tag

Authored by Kghbln on Oct 11 2017, 12:05 PM.

Description

Use LIBXML_NOEMPTYTAG to avoid creating self-closing <a> tag

Browsers just treat the self-closed <a> tag as only the open
tag, so anything after the map would become linked.

tidy normally cleans this up, but other wikis without it, or
those using RemexHtml would see this issue.

Fix suggested by Phabricator user Porplemontage

Bug: T136855
Change-Id: I3b00e1a9cbb096afebe37614a79548f64d561e3b
(cherry picked from commit 2ba1d20fcde046c0f8dc813d0d723c5858805ccd)

Details