Fix cornercases in Lagrange-interpolation subgrids

NNPDF / pineappl

PineAPPL is not an extension of APPLgrid

https://nnpdf.github.io/pineappl/

GNU General Public License v3.0

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Open cschwan opened 2 years ago

cschwan commented 2 years ago

We should not allow incorrectly set parameters, which will lead to problems similar to the one reported here: https://github.com/N3PDF/pineappl/pull/75#issuecomment-943106760