Fix crashes with invalid shapes in BulletPhysicsDirectSpaceState queries

(cherry picked from commit 8b0232bf295c924c157b30f78c9b991fb211dd73)

modules/bullet/space_bullet.cpp

@@ -123,6 +123,7 @@ int BulletPhysicsDirectSpaceState::intersect_shape(const RID &p_shape, const Tra
 		return 0;
 
 	ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
+	ERR_FAIL_COND_V(!shape, 0);
 
 	btCollisionShape *btShape = shape->create_bt_shape(p_xform.basis.get_scale_abs(), p_margin);
 	if (!btShape->isConvex()) {
@@ -163,6 +164,7 @@ bool BulletPhysicsDirectSpaceState::cast_motion(const RID &p_shape, const Transf
 		return false;
 
 	ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
+	ERR_FAIL_COND_V(!shape, false);
 
 	btCollisionShape *btShape = shape->create_bt_shape(p_xform.basis.get_scale(), p_margin);
 	if (!btShape->isConvex()) {
@@ -215,6 +217,7 @@ bool BulletPhysicsDirectSpaceState::collide_shape(RID p_shape, const Transform &
 		return 0;
 
 	ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
+	ERR_FAIL_COND_V(!shape, false);
 
 	btCollisionShape *btShape = shape->create_bt_shape(p_shape_xform.basis.get_scale_abs(), p_margin);
 	if (!btShape->isConvex()) {
@@ -247,6 +250,7 @@ bool BulletPhysicsDirectSpaceState::collide_shape(RID p_shape, const Transform &
 bool BulletPhysicsDirectSpaceState::rest_info(RID p_shape, const Transform &p_shape_xform, float p_margin, ShapeRestInfo *r_info, const Set<RID> &p_exclude, uint32_t p_collision_mask, bool p_collide_with_bodies, bool p_collide_with_areas) {
 
 	ShapeBullet *shape = space->get_physics_server()->get_shape_owner()->get(p_shape);
+	ERR_FAIL_COND_V(!shape, false);
 
 	btCollisionShape *btShape = shape->create_bt_shape(p_shape_xform.basis.get_scale_abs(), p_margin);
 	if (!btShape->isConvex()) {