Oops, null pointers fixed.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1749 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CParticleSystemSceneNode.cpp

@@ -491,8 +491,11 @@ void CParticleSystemSceneNode::setParticleSize(const core::dimension2d<f32> &siz
 {
 	//A bit of a hack, but better here than in the particle code
 	const core::vector2df tempsize(size.Width, size.Height);
+	if (Emitter)
+	{
 		Emitter->setMinStartSize(tempsize);
 		Emitter->setMaxStartSize(tempsize);
+	}
 	ParticleSize = size;
 }