[luatex] LuaTeX 1.10.1-svn7138 breaks fontspec package

[Khaled Hosny]

Hi all,

Something in the svn 7138 revision breaks fontspec package. In the
attached document the first line is fine, but the second line will give
the warning:

Package fontspec Warning: Font "amiri-regular" does not contain requested
(fontspec)                Script "Latin".

It seems in the second line fontspec is checking with an empty font
csname. I couldn’t manage to come with a plain TeX file that shows the
issue, but the warning goes away if I revert this chunk:
https://github.com/TeX-Live/luatex/commit/e4181e6126b060645f257ec64043bc9eae699576#diff-a34a3b72620549296a59c3bcb1010ff8L218

Regards,
Khaled
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