Add `None` mark to module object
Add `None` mark to module object

Applicable only when it fallbacks to the default value. This may output shown by
travis more informative. And in any case old code contained a bug.

magus424/powerline,S0lll0s/powerline,Luffin/powerline,xxxhycl2010/powerline,darac/powerline,xfumihiro/powerline,russellb/powerline,seanfisk/powerline,wfscheper/powerline,magus424/powerline,areteix/powerline,areteix/powerline,cyrixhero/powerline,EricSB/powerline,blindFS/powerline,junix/powerline,prvnkumar/powerline,cyrixhero/powerline,xfumihiro/powerline,bartvm/powerline,seanfisk/powerline,seanfisk/powerline,Liangjianghao/powerline,s0undt3ch/powerline,s0undt3ch/powerline,xxxhycl2010/powerline,bezhermoso/powerline,Liangjianghao/powerline,lukw00/powerline,s0undt3ch/powerline,S0lll0s/powerline,IvanAli/powerline,IvanAli/powerline,dragon788/powerline,magus424/powerline,Luffin/powerline,firebitsbr/powerline,russellb/powerline,Liangjianghao/powerline,areteix/powerline,bartvm/powerline,xxxhycl2010/powerline,dragon788/powerline,prvnkumar/powerline,lukw00/powerline,russellb/powerline,dragon788/powerline,EricSB/powerline,kenrachynski/powerline,DoctorJellyface/powerline,darac/powerline,blindFS/powerline,junix/powerline,wfscheper/powerline,darac/powerline,QuLogic/powerline,IvanAli/powerline,bezhermoso/powerline,firebitsbr/powerline,cyrixhero/powerline,Luffin/powerline,kenrachynski/powerline,prvnkumar/powerline,bartvm/powerline,DoctorJellyface/powerline,firebitsbr/powerline,EricSB/powerline,QuLogic/powerline,kenrachynski/powerline,DoctorJellyface/powerline,S0lll0s/powerline,junix/powerline,lukw00/powerline,xfumihiro/powerline,wfscheper/powerline,blindFS/powerline,bezhermoso/powerline,QuLogic/powerline