bug#17009: Please add a hook to visual-line-mode

[Dmitry Gutov]

Reuben Thomas <rrt@sc3d.org> writes:

> So this is a hook that magically comes into existence if I assign to it:
> having done so, C-h v now works.

That's true of all hooks: a hook variable doesn't have to be defined for
`add-hook' or `run-hooks' to work. Of course, the latter won't do
anything in that case.