minor: Make @PSR12 remove anonymous classes empty braces #6544
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Closes #6536.
IMO PSR-12 does not actually enforce or forbid empty braces for anonymous classes, but the examples imply it is preferred not to have them so always removing them is closer to that.
As a next step, I think it would be nice to make the
anonymous_class
option acceptnull
, in which case it would ignore anonymous classes entirely.