Add detection of missing python source

Detect missing .py for .pyc or pyo

Signed-off-by: Bastien ROUCARIÈS <roucaries.bastien+debian@gmail.com>
L::Unpacker: Apply perltidy

Signed-off-by: Niels Thykier <niels@thykier.net>
t: Fix minor pedantic issues

Signed-off-by: Niels Thykier <niels@thykier.net>