Improve the hafs_obs_prep job script to handle zero bytes gfs.tCCz.prepbufr file

[BinLiu-NOAA]

Description

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From NCO SPA: In the HAFS v1.0 IT tests, tested the hafs_obs_prep job with a gfs.tCCz.prepbufr file with zero bytes. Expected the job should failed with error message, similar as HWRF jhwrf_bufrprep job, “CRITICAL: HWRF bufrprep is aborting:
gfs.t00z.prepbufr: is non-existant or empty”. But the hafs_obs_prep job proceeded with failure nor error message.

Please look into this at the next upgrade to improve the hafs_obs_prep job to properly check and fail when the gfs.tCCz.prepbufr file has zero bytes.

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• fixed by hafs-community/hafs/pull/<pr_number>

[BinLiu-NOAA]

Updated exhafs_obs_prep.sh so that it checks if the gfs prepbufr file exists and is non-empty, otherwise it exits with a "FATAL ERROR" (see ed0d888).