ParticleSystem serialize problem

1.  these two is missing... both in serialize and parse.

particle.minEmitPower
particle.maxEmitPower

2. if i dont have an object emitter but only set a position emitter, 

in serialize:

serializationObject.emitterId = this.emitter.id; //(it will be null).

and in parse:

var emitter = scene.getLastMeshByID(parsedParticleSystem.emitterId); //(null...)

var particleSystem = new ParticleSystem("particles#" + emitter.name, parsedParticleSystem.capacity, scene);

problem is emitter.name will be error.