_init() not work in visual script

[jihot2000]

Godot version: Godot 3.2 alpha2

OS/device including version: Ubuntu 18.04 LTS x86_64

Issue description: _init() not work in visual script

Steps to reproduce:
Create a simple visual script like:

Nothing was printed in the output tab when running.

I also tried to assign a value to a member variable in _init(). But I found its value was not changed when I printed in _ready() function.

Minimal reproduction project:

[fire]

Can you use _ready() for your purposes?

[jihot2000]

Can you use _ready() for your purposes?

Yes. I've moved the init logic to _ready(). It took me some time to find this issue. I think the _init() bug should be fixed for completeness of visual script.

[KoBeWi]

Still valid in 207cfc9