if the pid file is not there as a result of shutting it down it should simply not start it.
a check can be done for an exemption clause like:
The missing pidfile is not necessarily sign that the process was shutdown intentionally and should not be started. For example when the machine just started and Monit is supposed to start the process, the pidfile may be missing.
If you want to stop the process which is monitored by Monit, you should either disable the monitoring: