Bugfix commit reference to the target project

When the master branch in the fork is not updated, the commit with the tool starts isn't available in the fork. So this produces an exception that we can fix simply by using the target project object that, as it is the source of the cloned repo, will have it print the link.

Signed-off-by: Sergi Blanch Torne sergi.blanch.torne@collabora.com