Fix bug with attribute "traceback" of exceptions if debug mode is not set
Fix bug with attribute "traceback" of exceptions if debug mode is not set

jonathanverner/brython,Mozhuowen/brython,amrdraz/brython,olemis/brython,Isendir/brython,kevinmel2000/brython,kevinmel2000/brython,kikocorreoso/brython,firmlyjin/brython,brython-dev/brython,Lh4cKg/brython,rubyinhell/brython,Hasimir/brython,kikocorreoso/brython,firmlyjin/brython,Hasimir/brython,kevinmel2000/brython,firmlyjin/brython,amrdraz/brython,molebot/brython,brython-dev/brython,olemis/brython,olemis/brython,jonathanverner/brython,jonathanverner/brython,kevinmel2000/brython,firmlyjin/brython,Lh4cKg/brython,JohnDenker/brython,olemis/brython,amrdraz/brython,Isendir/brython,JohnDenker/brython,amrdraz/brython,rubyinhell/brython,rubyinhell/brython,Lh4cKg/brython,jonathanverner/brython,Mozhuowen/brython,firmlyjin/brython,Isendir/brython,brython-dev/brython,JohnDenker/brython,kikocorreoso/brython,rubyinhell/brython,Mozhuowen/brython,molebot/brython,Lh4cKg/brython,Isendir/brython,molebot/brython,Hasimir/brython,Hasimir/brython,molebot/brython,JohnDenker/brython,Mozhuowen/brython