Generate a lot of errors on node that are connected to signals

Hi!

Thanks for this very nice tool.

I have use it to spawn node that are connected to signal within itself.

I got an error message for each one "signal X is already connected to y" when baking. 
When baking a lot, godot crashes, certainly because of that.

Connecting to signal manually via gdscript seems to fix it! The problem seems to happend only when connecting via the UI.