[LyX/master] Fixup 294e4884: center correctly Abstract label when paragraph is empty

[Scott Kostyshak]

On Tue, Feb 09, 2021 at 07:18:20PM +0100, Jean-Marc Lasgouttes wrote:
> Le 09/02/2021 à 19:07, Scott Kostyshak a écrit :

> > No problem. I think it's a somewhat rare bug so doesn't affect testing.
> > Let me know if you want me to open a trac ticket for it.
> 
> Yes please. I have to fix it anyway.

Done at #12118.

Scott
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