[LyX/master] Fix crash after 24926b2e239.

[Scott Kostyshak]

On Sat, Mar 28, 2020 at 08:05:04PM +0100, Richard Kimberly Heck wrote:
> commit 104fdcc9be40df19d50cddad7f8ae9ab63bbf5f7
> Author: Richard Kimberly Heck <rikiheck at lyx.org>
> Date:   Sat Mar 28 15:23:13 2020 -0400
> 
>     Fix crash after 24926b2e239.
>     
>     The matched element may not have a parent. I guess the old version of
>     setExpanded too care of that. Now we have to do so.
> ---

Thanks for fixing that, Riki. Did you by chance audit the others of
24926b2e239? If not, I will take a look. Note to self: there is also
a similar change at 273af880.

Scott
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