test: add a default greeting to avoid printing a null pointer.
Reviewed-by:Shane Lontis <shane.lontis@oracle.com> Reviewed-by:
Paul Yang <kaishen.yy@antfin.com> (Merged from https://github.com/openssl/openssl/pull/25221)
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Reviewed-by:Shane Lontis <shane.lontis@oracle.com> Reviewed-by:
Paul Yang <kaishen.yy@antfin.com> (Merged from https://github.com/openssl/openssl/pull/25221)