Revert "don't send bulk_read_entry_response messages containing no data" (r4099)
Revert "don't send bulk_read_entry_response messages containing no data" (r4099)

-> we need this for e.g. range reads to know which ranges have been covered or not
seyyed/scalaris,tectronics/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,tectronics/scalaris,digshock/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris,digshock/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris,seyyed/scalaris,digshock/scalaris,tectronics/scalaris