unwrap_pyoptcol is missing except keyword that causes exceptions ignored, fixes function bug

[isVoid]

Description

Fixes a bug in the cdef function when pyoptcol is None and gets mishandled (raised as error). This error is captured in one of the pytests for point_linestring_distance. However, due to the cdef function is missing the except keyword, the exception gets ignored by the python interpreter and not reraised.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[isVoid]

@gpucibot merge