LWG3850 views::as_const on empty_view<T> should return empty_view<const T>

Author: burblebee

source/ranges.tex

@@ -8628,6 +8628,10 @@
 then \tcode{views::all(E)}.
 \item
 Otherwise,
+if \tcode{U} denotes \tcode{empty_view<X>}
+for some type \tcode{X}, then \tcode{auto(views::empty<const X>)}.
+\item
+Otherwise,
 if \tcode{U} denotes \tcode{span<X, Extent>}
 for some type \tcode{X} and some extent \tcode{Extent},
 then \tcode{span<const X, Extent>(E)}.