Crash when stop adding particles

[lwaarbroek]

thanks for the great addon first of all!

I have the following issue: after spiting out particles I'd like to stop emitting and wait for all particles to be despawned by their lifetime and then remove the particle system. However when I stop calling addParticles I get a "list iterator is not incrementable" error on line 399 of ofxParticles.h

Also tried setting the numPars to 0 but this has the same effect.