nebula-cert cmdnow throws help message when fail

refresh-NebulaCA

@@ -123,5 +123,11 @@ if [[ $CERTISCASTATUS == true ]]; then
     echo "DateTime: ${DATETIME}"
     echo "NEWFILENAME: ${NEWFILENAME}"
     echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
+    try
+    (
     ${ROOTPATH}/nebula-cert sign -name ${CANAME} -out-crt ${ROOTPATH}/${NEWFILENAME}.crt -out-key ${ROOTPATH}/${NEWFILENAME}.key
+    )
+    catch || {
+        help_msg
+    }
 fi