[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix.

[Marco Caliari]

Follow-up Comment #11, bug #56232 (project octave):

Surprise: [L, U] = lu (C - C) does the right thing (L is the identity, U is
null, as in the full case, as in Matlab) but gives the "symbolic factorization
failed" message with sparse (2, 2, 0).
So, I see now two problems:

1) why C - C is different from sparse (2, 2, 0)
2) tinverse and dinverse should be adapted for zeros in the diagonal, if we
want to invert a matrix by inverting its factors, and the matrix is singular

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