Fix T40299, Crash on rendering due to dependency cycles and NULL pointer when using particle duplis.

source/blender/blenkernel/intern/particle.c

@@ -1907,7 +1907,7 @@ void psys_particle_on_emitter(ParticleSystemModifierData *psmd, int from, int in
                               float fuv[4], float foffset, float vec[3], float nor[3], float utan[3], float vtan[3],
                               float orco[3], float ornor[3])
 {
-	if (psmd) {
+	if (psmd && psmd->dm) {
 		if (psmd->psys->part->distr == PART_DISTR_GRID && psmd->psys->part->from != PART_FROM_VERT) {
 			if (vec)
 				copy_v3_v3(vec, fuv);