So "grep -v" returns != 0, if your input or output file is empty.
which breaks the Jenkins build, because Jenkins runs scripts with
-xe per default.

The "strip comments" grep currently fails for the empty file
instsetoo_native/inc_openoffice/windows/msi_templates/components.txt

Change-Id: I53a477702dbcc3c00c4a23263c3b402cb936250a
(cherry picked from commit d526f5d7)
Reviewed-on: https://gerrit.libreoffice.org/19098Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit e0b2971d)