Error in writing out r4 real data

This is with release-cesm2.0.01 which brings in a change to write out real data as r4 instead of everything being r8.

The following tests fail:

ERP_Ld5.f10_f10_musgs.I2000Clm50Vic.cheyenne_gnu.clm-decStart.GC.release-clm5009chgnua
ERP_P36x2_D_Ld5.f10_f10_musgs.I1850Clm45Bgc.cheyenne_gnu.clm-default.GC.release-clm5009chgnua
ERP_P36x2_D_Ld5.f10_f10_musgs.I1850Clm45BgcCru.cheyenne_intel.clm-default.GC.release-clm5009chintela
ERP_P36x2_D_Ld5.f10_f10_musgs.I2000Clm45Sp.cheyenne_intel.clm-default.GC.release-clm5009chintela
ERP_P36x2_D_Ld5.f10_f10_musgs.IHistClm45BgcCruGs.cheyenne_intel.clm-decStart.GC.release-clm5009chintela
ERS_Ly5_P72x1.f10_f10_musgs.IHistClm45BgcCrop.cheyenne_intel.clm-cropMonthOutput.GC.release-clm5009chintela

The fail looks like:

1: pio_support::pio_die:: myrank=          -1 : ERROR: 
1: pionfwrite_mod::write_nfdarray_real:         250 : 
1: NetCDF: Numeric conversion not representable
37: pionfwrite_mod::write_nfdarray_real         107   IAM:            1  start: 
37:                     1                   181  count:                    720
37:                   180  size :                     1  error:          -60
37:         598           0
37: pio_support::pio_die:: myrank=          -1 : ERROR: 
37: pionfwrite_mod::write_nfdarray_real:         250 : 
37: NetCDF: Numeric conversion not representable
1:Image              PC                Routine            Line        Source             
1:cesm.exe           00000000019272AD  Unknown               Unknown  Unknown
1:cesm.exe           000000000124DAA1  pio_support_mp_pi         118  pio_support.F90
1:cesm.exe           000000000124BC51  pio_utils_mp_chec          59  pio_utils.F90
1:cesm.exe           000000000134E9DA  pionfwrite_mod_mp         250  pionfwrite_mod.F90.in
1:cesm.exe           000000000130D2AA  piodarray_mp_writ         650  piodarray.F90.in
1:cesm.exe           000000000130FF51  piodarray_mp_writ         221  piodarray.F90.in
1:cesm.exe           0000000000C93F30  rtmio_mp_ncd_io_r        1825  RtmIO.F90
1:cesm.exe           0000000000C86EF0  rtmhistfile_mp_ht         930  RtmHistFile.F90
1:cesm.exe           0000000000C8476C  rtmhistfile_mp_rt        1099  RtmHistFile.F90
1:cesm.exe           0000000000CA0ED9  rtmmod_mp_rtmrun_        1309  RtmMod.F90
1:cesm.exe           0000000000C795A8  rof_comp_mct_mp_r         298  rof_comp_mct.F90
1:cesm.exe           0000000000424B34  component_mod_mp_         728  component_mod.F90
1:cesm.exe           000000000040A369  cime_comp_mod_mp_        2675  cime_comp_mod.F90
1:cesm.exe           0000000000424862  MAIN__                    103  cime_driver.F90
1:cesm.exe           000000000040829E  Unknown               Unknown  Unknown
1:libc-2.19.so       00002AAAB04DCB25  __libc_start_main     Unknown  Unknown
1:cesm.exe           00000000004081A9  Unknown               Unknown  Unknown
1:MPT ERROR: Rank 1(g:1) is aborting with error code 1.

The problem is likely that there are nans that are trying to be converted to real(r4), and it can't do that.