bug#40968: 28.0.50; (apply nil)

[Mattias Engdegård]

That patch is fine but perhaps incomplete, if we want (apply nil) to result in 
the same error when interpreted and byte-compiled.
Suggested test case attached.

The manual change is fine. Perhaps we should adopt a somewhat discouraging tone.
You could also say that (apply X) is defined as (apply (car X) (cdr X)), and X 
must be a cons.

test.diff
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