reduce minutely runs by checking for active players first

chunkymap-cronjob

@@ -1,4 +1,8 @@
 #!/bin/sh
 # NOTE: only works since all scripts in /etc/cron.*/ or crontab run as root
 #python /home/owner/minetest/util/chunkymap-regen.py
+#-1 FOR LESS THAN ONE MINUTE AGO:
+MT_PLAYERS_ACTIVE_COUNT=$(find /var/www/html/minetest/chunkymapdata/players -type f -mmin -1 | wc -l)
+if[ $MT_PLAYERS_ACTIVE_COUNT -gt 0 ]; then
 	flock -n /var/run/chunkymap-regen.lockfile -c /home/owner/minetest/util/chunkymap-regen.sh
+fi