project.py: Fix check for wild cards

The intention of the check is to verify whether the target
file name contains a wild card. The code, however, assumes
that if the file is non-existent - it contains a wild card.
This has the side effect that a target file that does not
exist at the moment of the check is considered to contain a
wild card, this leads itself to softlink not being created.

Change-Id: I4e4cd7b5e1b8ce2e4b2edc9abf5a1147cd86242f
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/265736
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Angel Petkov <apetkov86@gmail.com>