do not read empty file on retry.sh error (#32811)
do not read empty file on retry.sh error (#32811)

The error is already output to stdout/stderr, so no need to output it
again - and the file doesn't exist in error cases anyways so its not
useful to attempt it.
istio/istio,istio/istio,istio/istio,istio/istio,istio/istio