The error message talks about "empty hook name" not about "empty hook"

base/doc/ltnews40.tex

@@ -472,7 +472,7 @@ \subsection{Improved error raised by empty hook}
 \end{verbatim}
 This has now been improved. Now an empty hook raises
 \begin{verbatim}
-! LaTeX hooks Error: Empty hook on line ..
+! LaTeX hooks Error: Empty hook name on line ..
 \end{verbatim}
 %
 \githubissue{1423}