handle the case where an entry-point return non-answers for both part…

[wimglenn]

…s. closes #156

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.15%. Comparing base (143461e) to head (eada9f7).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/test_runner.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   91.11%   91.15%   +0.04%     
==========================================
  Files          25       25              
  Lines        2781     2805      +24     
  Branches      252      253       +1     
==========================================
+ Hits         2534     2557      +23     
- Misses        179      180       +1     
  Partials       68       68              

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