lyx2lyx error

[José Matos]

On Wed, 2023-09-06 at 07:36 +0100, José Matos wrote:
> So it seems that what should not happen happened. :-)
> 
> This means that something unexpected is happening and the code is not
> able to react to it.

My analysis was not entirely correct. :-)

In any case the issue is that function returns either False or a
triplet with expected values.

The funny thing, at least to me, is that the corresponding construct in
C++ is std::optional (C++17 and later)
https://en.cppreference.com/w/cpp/utility/optional

again C++ is converging to python. :-D

With the original file (from the bug reporter) it was possible to
construct a minimal file, that follows attached.

The fix was then simple and also follows attached. Please commit it.

Best regards,
-- 
José Abílio
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