Bug in 10cm Reflectivity Calculation.

[andrewgettelman]

The 10cm reflectivity calculation recently introduced in PUMAS is calculating infinity at some locations when used with micro_mg_do_hail = .true.

This is due to a bug in the logic of the conditional to trap for this which currently only works with graupel.

The bug is here in this line

https://github.com/ESCOMP/PUMAS/blob/pumas_cam-release_v1.26/micro_pumas_v1.F90#L4286

if (do_hail .or. do_graupel .and. lamg(i,k) > 0._r8) then

should be:

if ((do_hail .or. do_graupel) .and. lamg(i,k) > 0._r8) then

I'll need some help in adding this to the next PUMAS tag and making a PR. Should be quick. One line change. Thanks!