VOCemission receives negative cisun_z and cisha_z values

[mvdebolskiy]

Brief summary of bug

cisun_z and cisha_z are -999 for non-bareground pfts

General bug information

CTSM version you are using: [output of git describe]

ctsm5.3.014-1-g51517197b
https://github.com/mvdebolskiy/CTSM/tree/bug/isoprene-check
just add this check in VOCemission, before the gamma_c is calculated:

                if (cisha_z(p,1) < 0.0_r8 .or. cisun_z(p,1) < 0.0_r8) then
                   write(iulog,*) 'Invalid intercellular co2 pressure (patch itype, sunlit, shaded): ', patch%itype(p),cisun_z(p,1),cisha_z(p,1)
                   call endrun(subgrid_index=p, subgrid_level=subgrid_level_patch, msg=errMsg(sourcefile, __LINE__))
                endif

Does this bug cause significantly incorrect results in the model's science? [Yes / No]

No idea

Configurations affected: [Fill this in if known.]

At least Clm60Sp and Clm60Bgc compsets.

Details of bug

cisun_z is set to -999 in the begining of the clm_drv, even though photosynthesis routines are called before VOCemission, not all the patches actually assign a proper value.

Important details of your setup / configuration so we can reproduce the bug

These tests:
SMS_D_Lm3.f09_f09_mg17.I2000Clm60Sp.derecho_intel.clm-default
SMS_D_Lm3.f09_f09_mg17.I2000Clm60Bgc.derecho_intel.clm-default

Important output or errors that show the problem