occ_maintenance.sh: remove LOCK directory if no previos process is running.

occ_maintenance.sh

@@ -209,6 +209,10 @@ if pgrep -f "$(basename $0)" | grep -q -v $$ ; then
    echo
 
    exit 1
+else
+   if [[ -d "$LOCK_DIR" ]] ; then
+      rm -rf "$LOCK_DIR" 2> /dev/null
+   fi
 fi