Handling of empty arrays may be broken

[ralphlange]

A recently fixed bug in the CA Gateway in a subroutine copied from PCAS suggests that the code in

pcas/src/pcas/generic/casStrmClient.cc

Lines 799 to 801 in 4f60f2d

	if ( nativeCount <= 1 ) {
	return S_cas_success;
	}

breaks the handling of empty arrays.
(See epics-extensions/ca-gateway#56)

If such issues show up, a fix modeled after the CA Gateway fix (epics-extensions/ca-gateway#57) should be tested.