Merge pull request #11405 from Security-Onion-Solutions/jertel/lc

deb OS doesn't use /var/log/cron, skip

salt/common/tools/sbin/so-log-check

@@ -178,7 +178,9 @@ done
 
 # Check Security Onion related log files
 find /opt/so/log/ /nsm -name \*.log > /tmp/log_check_files
-echo "/var/log/cron" >> /tmp/log_check_files
+if [[ -f /var/log/cron ]]; then
+    echo "/var/log/cron" >> /tmp/log_check_files
+fi
 exclude_log "kibana.log"
 exclude_log "spool"
 exclude_log "import"