Store empty (default) branch in branch cache, too. Operations on this branch don't work otherwise. Reading branches.cache had to be adjusted to allow an empty label. Adjusted reading of the cache tip for symmetry, no functional change here.

#!/bin/sh

hg init

echo a > a
hg ci -d '0 0' -Ama

hg an a

echo "[ui]" >> $HGRCPATH
echo "strict=True" >> $HGRCPATH

hg an a
hg annotate a

echo % should succeed - up is an alias, not an abbreviation

hg up