lyx2lyx regression? Malformed LyX document after roundtrip

[Scott Kostyshak]

On current master I get the following:

$ lyx -e lyx20x Beamer.lyx && lyx Beamer.20.lyx
Warning: Malformed LyX document: Missing layout name on line 1876
Warning: Malformed LyX document: Missing layout name on line 3053
Warning: Malformed LyX document: Missing layout name on line 4716

The reason this might be a regression is that if I first export to 2.3.x
format, and then in 2.3.0 I do the roundtrip with 2.0.x format, I do not
get those warnings:

$ lyx -e lyx23x Beamer.lyx
$ lyx230 -e lyx20x Beamer.23.lyx && lyx230 Beamer.23.20.lyx
$

Scott
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