CHOLMOD: introduce bool nIsZero_
It can happen that we work on a 0 times 0 matrix due to ignore fields or other reasons. This leads to undefined behavior in the cholmod lib.
We simply catch this case by introducing a bool value.
It can happen that we work on a 0 times 0 matrix due to ignore fields or other reasons. This leads to undefined behavior in the cholmod lib.
We simply catch this case by introducing a bool value.