Running a case with files with zero size doesn't give a graceful error

I ran a case with some forcing files that had zero size. Obviously that is a problem and I shouldn't expect it to run. The problem is that I don't see an error that I can figure out what the problem is. There's nothing in the atm.log file, and the cesm.log contains nothing informative. Since, most files were fine, my spot checking a few files didn't spot the issue. It would be helpful if when it encounters such a problem a useful error message is given about the zero size file. So I know what the problem is, what file it is, and how to fix it.

The test is:

SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default

Where many of the files had zero size, such as...

``` text
Model datm missing file file203 = '/glade/campaign/cesm/cesmdata/inputdata/atm/datm7/atm_forcing.datm7.NLDAS2.0.125d.v1/Precip/ctsmforc.NLDAS2.0.125d.v1.Prec.1996-11.nc'
Model datm missing file file204 = '/glade/campaign/cesm/cesmdata/inputdata/atm/datm7/atm_forcing.datm7.NLDAS2.0.125d.v1/Precip/ctsmforc.NLDAS2.0.125d.v1.Prec.1996-12.nc'
Model datm missing file file205 = '/glade/campaign/cesm/cesmdata/inputdata/atm/datm7/atm_forcing.datm7.NLDAS2.0.125d.v1/Precip/ctsmforc.NLDAS2.0.125d.v1.Prec.1997-01.nc'
Model datm missing file file206 = '/glade/campaign/cesm/cesmdata/inputdata/atm/datm7/atm_forcing.datm7.NLDAS2.0.125d.v1/Precip/ctsmforc.NLDAS2.0.125d.v1.Prec.1997-02.nc'
Model datm missing file file207 = '/glade/campaign/cesm/cesmdata/inputdata/atm/datm7/atm_forcing.datm7.NLDAS2.0.125d.v1/Precip/ctsmforc.NLDAS2.0.125d.v1.Prec.1997-03.nc'
```

cesm..log:
``` text
0: (t_initf) profile_single_file= F
0: (t_initf) profile_global_stats= T
0: (t_initf) profile_ovhd_measurement= F
0: (t_initf) profile_add_detail= F
0: (t_initf) profile_papi_enable= F
0: /glade/work/erik/ctsm_worktrees/main_dev/share/src/shr_file_mod.F90 912 This routine is depricated - use shr_log_setLogUnit instead -13
0:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
1:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
21:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
33:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
34:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
35:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
2:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
3:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
4:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
5:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
7:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
8:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
9:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
10:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
12:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
13:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
14:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
15:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
16:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
17:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
18:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
19:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
20:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
22:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
23:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
24:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
24:Obtained 10 stack frames.
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x1219b8c]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x1219c90]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x121a02b]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x121fbdc]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe(PIOc_openfile+0x7f) [0x12182b6]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x11c3e0e]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x106ac07]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x107b3a4]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x105e19c]
24:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x563b85]
25:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
26:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
26:Obtained 10 stack frames.
26:/glade/scratch/erik/SMS_D_Ld1_PS.nldas2_rnldas2_mnldas2.I2000Ctsm50NwpSpNldasRs.cheyenne_gnu.clm-default.GC.ctsm51d154redochlist/bld/cesm.exe() [0x1219b8c]
27:Abort with message Unknown error in file operation in file /glade/scratch/vanderwb/hpci-stack/221214-1434/23959/pio-2.5.10/src/clib/pioc_support.c at line 2832
27:Obtained 10 stack frames.
```

The only other file with content is the med.log file, which doesn't have anything remarkable.

Turning on the PET files I see this:
``` text
0 : ATM-TO-MED-State
20231126 201433.298 INFO PET000 ESM0001: InitializeIPDv02p3 intro: local peCount= 1
20231126 201433.298 INFO PET000 ESM0001: InitializeIPDv02p3 intro: local accDeviceCount= 0
20231126 201433.298 INFO PET000 ESM0001: InitializeIPDv02p3 intro: ssiLocalPetCount= 36
20231126 201433.298 INFO PET000 >>>ESM0001: entered Initialize (phase=IPDv02p3) with current time: 2000 1 1 0 0 0 0
20231126 201433.298 INFO PET000 (atm_comp_nuopc):(InitializeRealize) called
20231126 201433.772 INFO PET000 (shr_strdata_init_from_config) called
```

So we can see it's in the datm and in stream forcing files, but we can't tell what specific file(s) it's failing in.