Relative: Fix return of relative calculator if sim fails

[Doresic]

In case of simulation fail, the inner relative calculator did not return inner parameters to be added to the inner result. This caused some ValueError: too many values to unpack (expected 2) as a tuple was expected.

[dweindl]

thx 👍

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 53.33%. Comparing base (82b7d5d) to head (0e166a8).

Files	Patch %	Lines
pypesto/hierarchical/relative/calculator.py	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1315       +/-   ##
============================================
- Coverage    84.38%   53.33%   -31.06%     
============================================
  Files          153      153               
  Lines        12456    12456               
============================================
- Hits         10511     6643     -3868     
- Misses        1945     5813     +3868     

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