Enhance error handlings for missing input files (#2557)

Enhance error handling for missing input files in the WDQMS job script
With the missing stnstat file, the WDQMS processing job did not fail but
went through all FATAL ERROR and ran completely.

Refs #2389

scripts/exgdas_atmos_analysis_wdqms.sh

@@ -46,15 +46,15 @@ cd "${DATA}" || ( echo "FATAL ERROR: Unable to cd into '${DATA}', ABORT!"; exit
 # Copy cnvstat file from COMIN to DATA, untar and gunzip input files for wdqms.py
 # These should always be available
 cp "${COMIN}/${CNVSTAT}" .
-rc=$?
-(( rc != 0 )) && ( echo "FATAL ERROR: Unable to copy '${CNVSTAT}' from '${COMIN}', ABORT!"; exit 2 )
+export err=$?
+(( err != 0 )) && ( msg="Unable to copy '${CNVSTAT}' from '${COMIN}'"; err_exit "${msg}" )
 for diagfile in "${INPUT_LIST[@]}"; do
   tar -xvf "${CNVSTAT}" "${diagfile}.gz"
-  rc=$?
-  (( rc != 0 )) && ( echo "FATAL ERROR: Unable to extract '${diagfile}.gz' from '${CNVSTAT}', ABORT!"; exit 3 )
+  export err=$?
+  (( err != 0 )) && ( msg="Unable to extract '${diagfile}.gz' from '${CNVSTAT}'"; err_exit "${msg}" )
   gunzip "${diagfile}.gz"
-  rc=$?
-  (( rc != 0 )) && ( echo "FATAL ERROR: Unable to gunzip '${diagfile}.gz', ABORT!"; exit 3 )
+  export err=$?
+  (( err != 0 )) && ( msg="Unable to gunzip '${diagfile}.gz'"; err_exit "${msg}" )
 done
 
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