managed_bytes: simplify empty()
managed_bytes: simplify empty()

Signed-off-by: Paweł Dziepak <e29bb3265626c60caf76d587cabdfcd8b379ef80@cloudius-systems.com>

linearregression/scylla,duarten/scylla,stamhe/scylla,avikivity/scylla,bowlofstew/scylla,stamhe/scylla,dwdm/scylla,bowlofstew/scylla,guiquanz/scylla,raphaelsc/scylla,linearregression/scylla,duarten/scylla,glommer/scylla,rentongzhang/scylla,scylladb/scylla,kjniemi/scylla,rentongzhang/scylla,tempbottle/scylla,respu/scylla,gwicke/scylla,rluta/scylla,victorbriz/scylla,kjniemi/scylla,senseb/scylla,justintung/scylla,wildinto/scylla,victorbriz/scylla,kangkot/scylla,asias/scylla,phonkee/scylla,shaunstanislaus/scylla,eklitzke/scylla,raphaelsc/scylla,respu/scylla,acbellini/scylla,wildinto/scylla,rluta/scylla,senseb/scylla,kangkot/scylla,wildinto/scylla,aruanruan/scylla,avikivity/scylla,glommer/scylla,scylladb/scylla,capturePointer/scylla,justintung/scylla,shaunstanislaus/scylla,phonkee/scylla,tempbottle/scylla,raphaelsc/scylla,stamhe/scylla,glommer/scylla,aruanruan/scylla,linearregression/scylla,rentongzhang/scylla,eklitzke/scylla,bowlofstew/scylla,gwicke/scylla,shaunstanislaus/scylla,kangkot/scylla,tempbottle/scylla,senseb/scylla,asias/scylla,aruanruan/scylla,duarten/scylla,phonkee/scylla,avikivity/scylla,asias/scylla,guiquanz/scylla,justintung/scylla,guiquanz/scylla,dwdm/scylla,capturePointer/scylla,rluta/scylla,kjniemi/scylla,victorbriz/scylla,dwdm/scylla,gwicke/scylla,scylladb/scylla,capturePointer/scylla,acbellini/scylla,scylladb/scylla,respu/scylla,eklitzke/scylla,acbellini/scylla