As it turned out, there are some installations, where BSD label contains partitions with type zero. And it has worked. So, allow detect these partitions.
As it turned out, there are some installations, where BSD label
contains partitions with type zero. And it has worked.
So, allow detect these partitions.

Reported by:	glebius

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase