AAL/Python: fixed returning None from adapter log bug
AAL/Python: fixed returning None from adapter log bug

If the adapter block returns None, it's considered as a successful
execution of the adapter code.

heivi/fMBT,rseymour/fMBT,yoonkiss/fMBT,CosminNiculae/fMBT,pyykkis/fMBT,pablovirolainen/fMBT,pombreda/fMBT,pyykkis/fMBT,pyykkis/fMBT,mixu-/fMBT,01org/fMBT,acozzette/fMBT,yoonkiss/fMBT,mlq/fMBT,pombreda/fMBT,01org/fMBT,yoonkiss/fMBT,violep01/fMBT,acozzette/fMBT,CosminNiculae/fMBT,CosminNiculae/fMBT,mlq/fMBT,CosminNiculae/fMBT,pablovirolainen/fMBT,pyykkis/fMBT,pombreda/fMBT,pablovirolainen/fMBT,rseymour/fMBT,heivi/fMBT,acozzette/fMBT,mixu-/fMBT,mixu-/fMBT,OMKR/fMBT,01org/fMBT,heivi/fMBT,giantpinkwalrus/fMBT,heivi/fMBT,mlq/fMBT,mlq/fMBT,violep01/fMBT,OMKR/fMBT,giantpinkwalrus/fMBT,CosminNiculae/fMBT,pombreda/fMBT,acozzette/fMBT,pombreda/fMBT,pyykkis/fMBT,giantpinkwalrus/fMBT,mlq/fMBT,rseymour/fMBT,pyykkis/fMBT,violep01/fMBT,OMKR/fMBT,heivi/fMBT,OMKR/fMBT,pablovirolainen/fMBT,giantpinkwalrus/fMBT,01org/fMBT,mlq/fMBT,pablovirolainen/fMBT,OMKR/fMBT,violep01/fMBT,rseymour/fMBT,pablovirolainen/fMBT,rseymour/fMBT,pombreda/fMBT,mlq/fMBT,giantpinkwalrus/fMBT,rseymour/fMBT,mixu-/fMBT,CosminNiculae/fMBT,pombreda/fMBT,CosminNiculae/fMBT,rseymour/fMBT,violep01/fMBT,yoonkiss/fMBT,heivi/fMBT,OMKR/fMBT,01org/fMBT,acozzette/fMBT,mixu-/fMBT,yoonkiss/fMBT,heivi/fMBT