Antonio Sanchez b6db013435 Fix inverse nullptr/asan errors for LU.
For empty or single-column matrices, the current `PartialPivLU`
currently dereferences a `nullptr` or accesses memory out-of-bounds.
Here we adjust the checks to avoid this.


(cherry picked from commit 154f00e9eacaec5667215784c7601b55024e2f61)
2021-07-01 22:57:25 +00:00
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2016-01-27 22:48:40 +01:00
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