aa9599119a
These default assignements have not actually been needed/useful since a very long time already. It was likely a left-over from early stages of the project. While not a problem so far, it makes it harder to distinguish RNA properties whith a custom liboverride handling, from the ones using the default code. Keeping them to `nullptr` by default also makes these callbacks definition behavior more in line with other RNA properties callbacks, which are usually non-null only when a custom function is defined. No behavioral changes are expected from this commit.
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