bug#48408: BUGFIX: window-default-font-height: check for nil string

[Boruch Baum]

On 2021-05-14 09:09, martin rudalics wrote:
> > In package windows.el, function `window-default-font-height' calls
> > function `face-font', which can return a nil value, but performs a
> > `string-equal' operation on the output without checking for that
> > possibiliy.
>
> Please report this to the author(s) of that package.

I made a typo in calling it 'windows.el' instead of 'window.el'. I am
reporting on the emacs core package 'window.el':
;; Maintainer: emacs-devel@gnu.org

> What is `default-font'?

nil

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