MPAS get_close_obs if vertical location is MISSING_R8 returns 0 close obs

[hkershaw-brown]

Is this correct?
What about observations with VERTISUNDEF?

DART/models/mpas_atm/model_mod.f90

Lines 1889 to 1891 in e218864

	if (vertical_localization_on()) then
	if (base_llv(3) == MISSING_R8) then
	istatus1 = 1

MISSING_R8 is an acceptable valur for vloc?

DART/assimilation_code/location/threed_sphere/location_mod.f90

Lines 906 to 908 in e218864

	else if(location%which_vert == VERTISUNDEF ) then
	! a valid floating point value, but should be unused.
	location%vloc = MISSING_R8

[hkershaw-brown]

similarly, distance calculation

DART/models/mpas_atm/model_mod.f90

Lines 1939 to 1940 in e218864

	(local_obs_llv(3) == MISSING_R8)) .or. (istatus2 /= 0) ) then
	dist(k) = 1.0e9_r8