Merge pull request ESCOMP#173 from jedwards4b/need_fillvalue_att

Description of changes

Need to add a _FillValue attribute.
Specific notes

Contributors other than yourself, if any:

CDEPS Issues Fixed (include github issue #):

Are there dependencies on other component PRs (if so list):

Are changes expected to change answers (bfb, different to roundoff, more substantial):
bfb
Any User Interface Changes (namelist or namelist defaults changes):
no
Testing performed (e.g. aux_cdeps, CESM prealpha, etc):
ERS_Ld3.f45_g37_rx1.A.cheyenne_intel
Hashes used for testing: cesm commit e79aed81d07 (alpha09d)

dshr/dshr_mod.F90

@@ -1070,6 +1070,7 @@ subroutine dshr_restart_write(rpfile, case_name, model_name, inst_suffix, ymd, t
     if (present(fld) .and. present(fldname)) then
        rcode = pio_def_dim(pioid, 'gsize', sdat%model_gsize, dimid(1))
        rcode = pio_def_var(pioid, trim(fldname), PIO_DOUBLE, dimid, varid)
+       rcode = pio_put_att(pioid, varid, "_FillValue", shr_const_spval)
     endif
     call shr_stream_restIO(pioid, sdat%stream, 'define')
     rcode = pio_enddef(pioid)