Fix T38740: multi-user metaballs not rendering in Cycles.

Referenced by issue #38740, Metaballs don't get rendered in Cycles when they are multi user

intern/cycles/blender/blender_object.cpp

@@ -38,7 +38,11 @@ CCL_NAMESPACE_BEGIN
 bool BlenderSync::BKE_object_is_modified(BL::Object b_ob)
 {
 	/* test if we can instance or if the object is modified */
-	if(ccl::BKE_object_is_modified(b_ob, b_scene, preview)) {
+	if(b_ob.type() == BL::Object::type_META) {
+		/* multi-user and dupli metaballs are fused, can't instance */
+		return true;
+	}
+	else if(ccl::BKE_object_is_modified(b_ob, b_scene, preview)) {
 		/* modifiers */
 		return true;
 	}