Remove annoying warning
Remove annoying warning

An empty backtrace may actually make sense for threads in the "aborting"
state

os97673/byebug,yui-knk/byebug,k0kubun/byebug,yui-knk/byebug,deivid-rodriguez/byebug,ozydingo/byebug,guilherme/byebug,guilherme/byebug,k0kubun/byebug,scalp42/byebug,saisai/byebug,os97673/byebug,webdev1001/byebug,yui-knk/byebug,icebreaker/byebug,scalp42/byebug,miamiruby/byebug,icebreaker/byebug,webdev1001/byebug,deivid-rodriguez/byebug,deivid-rodriguez/byebug,k0kubun/byebug,ozydingo/byebug,saisai/byebug,miamiruby/byebug,guilherme/byebug