ShaderGraph shader turns black after save

[henkz1]

Operating system or device - Godot version: Ubuntu 16.04, master https://github.com/godotengine/godot/commit/a0dd7ec171001f9b9a14bafc0c9ed12623908984

Issue description (what happened, and what was expected): ShaderGraph shader display as expected until you save the scene, then they go black.

Steps to reproduce:

• add a quad
• create a new shader material for material override
• create a new shaderGraph shader
• add a texture uniform, connect uv and connect rgb to diffuse, you should see your texture
• save the scene, now the quad turns black

Link to minimal example project (optional but very welcome):

[MarianoGnu]

I realized this too...

[EdwardAngeles]

It happens to me too, although if I run the game the shader has effect in the game, to see it in the editor I have to reopen the editor :(

[MarianoGnu]

Fixed in #5308