|ind||The index of the particle system.|
With this function you can check to see if a particle system
currently has any particles created in the room, and it will return
the number of them too.
if part_particles_count(Sname) = 0
The above code will check the number of particles in the local particle system indexed in the variable "Sname" and if there are none, it will destroy the system and then the instance.