tests/test-revlog-group-emptyiter

cmdutil: minor refactoring of changeset_printer._show

- use ctx.branch() instead of directly accessing the extra field "branch"
- move definitions of locals ('extra' and 'branch') down to where they
  are used

#! /bin/sh

# issue 1678

echo "# -- setting up base repo"
hg init a
cd a
touch a
hg ci -Am a
cd ..

echo "# -- cloning base repo"
hg clone a b
cd b

echo "# -- setting up cset to push"
hg up null
touch a
hg ci -Am b # different msg so we get a clog new entry

echo "# -- pushing"
hg push -f ../a