Always write str() objects to the stream in echoerr
Always write str() objects to the stream in echoerr

Fixes #1331

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