* fixed a bug where an undefined $deb_upstart_paths would cause an exception blowing up the build.
* fixed a bug where an undefined $deb_upstart_paths would cause an exception blowing up the build.

Signed-off-by: Steve Houser <b222cffae4a3b03a5209b5c4bfc1448fa6500f91@gmail.com>

pwyliu/mkdeb,pwyliu/mkdeb