avoid calling (cd ...) with `nil' as a directory name
When (hg-root) cannot determine the current Mercurial root, print an
error message instead of trying to evaluate (cd nil).
include hg
recursive-include mercurial *.py
include hgweb.cgi hgwebdir.cgi
include hgeditor rewrite-log
include tests/README tests/*.py tests/test-*[a-z0-9] tests/*.out
prune tests/*.err
include *.txt
include templates/map templates/map-*[a-z0-9]
include templates/*.tmpl
include templates/static/*
include doc/README doc/Makefile doc/gendoc.py doc/*.txt doc/*.html doc/*.[0-9]
recursive-include contrib *
recursive-include hgext *
include README
include CONTRIBUTORS
include COPYING
include Makefile
include MANIFEST.in
prune *.elc *.orig *.rej *~ *.o *.so *.pyc *.swp *.prof