- removing the last particle system now exits particle edit mode.

- py UI script used an undeclared variable

release/scripts/ui/space_view3d_toolbar.py

@@ -830,6 +830,8 @@ class VIEW3D_PT_tools_particlemode(View3DPanel):
 
         layout.itemR(pe, "type", text="")
 
+        ptcache = None
+
         if pe.type == 'PARTICLES':
             if ob.particle_systems:
                 if len(ob.particle_systems) > 1:

source/blender/blenkernel/intern/particle.c

@@ -2276,7 +2276,7 @@ static int psys_threads_init_path(ParticleThread *threads, Scene *scene, float c
 /*	Object *ob= ctx->sim.ob; */
 	ParticleSystem *psys= ctx->sim.psys;
 	ParticleSettings *part = psys->part;
-	ParticleEditSettings *pset = &scene->toolsettings->particle;
+/*	ParticleEditSettings *pset = &scene->toolsettings->particle; */
 	int totparent=0, between=0;
 	int steps = (int)pow(2.0, (double)part->draw_step);
 	int totchild = psys->totchild;
@@ -3334,6 +3334,8 @@ void object_remove_particle_system(Scene *scene, Object *ob)
 
 	if(ob->particlesystem.first)
 		((ParticleSystem *) ob->particlesystem.first)->flag |= PSYS_CURRENT;
+	else
+		ob->mode &= ~OB_MODE_PARTICLE_EDIT;
 
 	DAG_scene_sort(scene);
 	DAG_id_flush_update(&ob->id, OB_RECALC_DATA);

source/blender/editors/physics/particle_object.c

@@ -93,11 +93,20 @@ static int particle_system_remove_exec(bContext *C, wmOperator *op)
 {
 	Object *ob= CTX_data_pointer_get_type(C, "object", &RNA_Object).data;
 	Scene *scene = CTX_data_scene(C);
-
+	int mode_orig = ob->mode;
 	if(!scene || !ob)
 		return OPERATOR_CANCELLED;
 
 	object_remove_particle_system(scene, ob);
+
+	/* possible this isn't the active object
+	 * object_remove_particle_system() clears the mode on the last psys
+	 * */
+	if(mode_orig & OB_MODE_PARTICLE_EDIT)
+		if((ob->mode & OB_MODE_PARTICLE_EDIT)==0)
+			if(scene->basact && scene->basact->object==ob)
+				WM_event_add_notifier(C, NC_SCENE|ND_MODE|NS_MODE_OBJECT, NULL);
+
 	WM_event_add_notifier(C, NC_OBJECT|ND_DRAW, ob);
 	
 	return OPERATOR_FINISHED;