Run savecore(8) only if there is a core dump to save. If there is

no core dump hide the message to that effect behind $rc_quiet.

etc/rc.d/savecore

@@ -57,8 +57,11 @@ savecore_prestart()
 
 savecore_start()
 {
-	[ -z "${rc_quiet}" ] && echo "Checking for core dump on ${dumpdev}..."
-	savecore ${savecore_flags} ${DUMPDIR} ${dumpdev}
+	if savecore -C >/dev/null; then
+		savecore ${savecore_flags} ${DUMPDIR} ${dumpdev}
+	else
+		[ -z "${rc_quiet}" ] && echo "No core dumps found"
+	fi
 }
 
 load_rc_config $name