Windy Darian 628f467605 Allow weakref(null) in gdscript ...

Tiny addition I personally found useful - this allows us to `var my_ref := weakref(null)` for nullable weak ref (with type hint!). When trying to test if `my_ref` is holding valid reference, we can just `if my_ref.get_ref():` instead of `if my_ref and my_ref.get_ref():` everywhere.

2019-09-16 23:15:34 -04:00

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