init: guard _namemap with repo.topics (issue5351)
This prevents reading extra data on all repo commits
when there is no topic for a given name.
_namemap is called a lot, and it is often called for commit
shas -- which should pretty much never be names of topics...
#!/bin/sh
# This file holds logic that is used in many tests.
# It can be called in a test like this:
# $ . "$TESTDIR/testlib"
# Enable obsolete markers and enable extensions
cat >> $HGRCPATH << EOF
[experimental]
evolution=createmarkers,exchange
[extensions]
rebase=
EOF
echo "topic=$(echo $(dirname $TESTDIR))/hgext3rd/topic" >> $HGRCPATH