My fault. I cleaned it up now:
sander@flappie:~/git/sanderjo-2014-04-04/sabnzbd$ grep -ir -P "\t"  sabnzbd/assembler.py
sander@flappie:~/git/sanderjo-2014-04-04/sabnzbd$ grep -ir -P "\t"  sabnzbd/cfg.py
sander@flappie:~/git/sanderjo-2014-04-04/sabnzbd$ grep -ir -P "\t"  SABnzbd.py
sander@flappie:~/git/sanderjo-2014-04-04/sabnzbd$

So no more tabs