Don't print an error when decoding a null Ref<T>

Author: dsnopek

include/godot_cpp/classes/ref.hpp

@@ -230,7 +230,9 @@ template <typename T>
 struct PtrToArg<Ref<T>> {
 _FORCE_INLINE_ static Ref<T> convert(const void *p_ptr) {
 GDExtensionRefPtr ref = (GDExtensionRefPtr)p_ptr;
-ERR_FAIL_NULL_V(p_ptr, Ref<T>());
+if (unlikely(!p_ptr)) {
+return Ref<T>();
+}
 return Ref<T>(reinterpret_cast<T *>(godot::internal::get_object_instance_binding(godot::internal::gdextension_interface_ref_get_object(ref))));
 }
 
@@ -254,7 +256,9 @@ struct PtrToArg<const Ref<T> &> {
 
 _FORCE_INLINE_ static Ref<T> convert(const void *p_ptr) {
 GDExtensionRefPtr ref = const_cast<GDExtensionRefPtr>(p_ptr);
-ERR_FAIL_NULL_V(p_ptr, Ref<T>());
+if (unlikely(!p_ptr)) {
+return Ref<T>();
+}
 return Ref<T>(reinterpret_cast<T *>(godot::internal::get_object_instance_binding(godot::internal::gdextension_interface_ref_get_object(ref))));
 }
 };