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 83.00%. Comparing base (5d48aac) to head (dee35e6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #168 +/- ## ========================================== + Coverage 82.98% 83.00% +0.02% ========================================== Files 17 17 Lines 823 824 +1 ========================================== + Hits 683 684 +1 Misses 140 140 ```

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