init: having keywords without value is not a global error.
We may later add a new configuration variable in "init" section that takes
a boolean value. Erroring out at the beginning of the config parser makes
life harder for later enhancement.
The existing configuration variable is parsed by git_config_pathname()
that checks and rejects init.templatedir that is unset without this extra
check. Remove it.
Signed-off-by: Steven Drake <sdrake@xnet.co.nz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>