compose: only add delimiter when a signature is defined

Inserting a solitary "-- " delimiter without any signature after it
makes no sense. Skip the whole delimiter check if the signature is
empty. Trim leading and trailing white space along the way.

Fixes: a553b33ebcbd ("compose: ensure signature uses standard delimiter")
Reported-by: Ben Cohen <ben@bencohen.net>
Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Ben Cohen <ben@bencohen.net>

0 files changed, 0 insertions, 0 deletions