163 conversion of the hessian into a pdmat object may cause an error

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.98%. Comparing base (dcfa0be) to head (43d56c0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #165 +/- ## ========================================== + Coverage 82.94% 82.98% +0.04% ========================================== Files 17 17 Lines 821 823 +2 ========================================== + Hits 681 683 +2 Misses 140 140 ```

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