Remove error when creating Tween directly

Author: Kaleb-Reid

scene/animation/tween.cpp

@@ -531,10 +531,6 @@ void Tween::_bind_methods() {
 	BIND_ENUM_CONSTANT(EASE_OUT_IN);
 }
 
-Tween::Tween() {
-	ERR_FAIL_MSG("Tween can't be created directly. Use create_tween() method.");
-}
-
 Tween::Tween(SceneTree *p_parent_tree) {
 	parent_tree = p_parent_tree;
 	valid = true;

scene/animation/tween.h

@@ -188,7 +188,7 @@ class Tween : public RefCounted {
 	Node *get_bound_node() const;
 	double get_total_time() const;
 
-	Tween();
+	Tween() {};
 	Tween(SceneTree *p_parent_tree);
 };