contrib/tcsh_completion

tests: don't match blank output lines as regexes in unified tests

Currently, the following unified test will pass:

  $ echo foo


A blank output line (a line containing just two spaces) will match any
output.

The patch modifies the unified test runner to ignore empty strings
strings when do regular expression matching.

#
# tcsh completion for Mercurial
#
# This file has been auto-generated by tcsh_completion_build.sh for
# Mercurial Distributed SCM (version 1.5.4+154-8b452fe4bf50)
#
# Copyright (C) 2005 TK Soh.
#
# This is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#

complete hg \
  'n/--cwd/d/' 'n/-R/d/' 'n/--repository/d/' \
  'C/-/( -R --repository \
    --cwd \
    -y --noninteractive \
    -q --quiet \
    -v --verbose \
    --config \
    --debug \
    --debugger \
    --encoding \
    --encodingmode \
    --traceback \
    --time \
    --profile \
    --version \
    -h --help)/' \
  'p/1/(add addremove annotate blame archive \
    backout bisect branch branches bundle \
    cat clone commit ci copy \
    cp debugancestor debugbuilddag debugcheckstate debugcommands \
    debugcomplete debugdag debugdata debugdate debugfsinfo \
    debugindex debugindexdot debuginstall debugpushkey debugrebuildstate \
    debugrename debugrevspec debugsetparents debugstate debugsub \
    debugwalk diff export forget grep \
    heads help identify id import \
    patch incoming in init locate \
    log history manifest merge outgoing \
    out parents paths pull push \
    recover remove rm rename mv \
    resolve revert rollback root serve \
    showconfig debugconfig status st summary \
    sum tag tags tip unbundle \
    update up checkout co verify \
    version)/'