UUID.empty
bool empty() @trusted pure nothrow @nogc @property constReturns true if and only if the UUID is equal to {00000000-0000-0000-0000-000000000000}
bool empty() @trusted pure nothrow @nogc @property constReturns true if and only if the UUID is equal to {00000000-0000-0000-0000-000000000000}