- fix in dead block detection   (bug in handling nested empty blocks {{x}y} )
- fix in dead block detection
  (bug in handling nested empty blocks {{x}y} )

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb