Description

This is an hotfix for the C-model post-processing (more in general for all grouped bars plots).

It fixes issue #287 that is generated by only newer python versions.

Type of change

Please select what type of change this is.

[ x] Bug fix (non-breaking change which fixes an issue)
[ ] New benchmark
- [ ] Non-breaking change which entirely uses exisiting classes, structure etc
- [ ] Breaking change which has implemented new/modified classes etc
[ ] New feature
- [ ] Non-breaking change which adds functionality
- [ ] Breaking change fix or feature that would cause existing functionality to not work as expected

Post-processing of C-Model now runs correctly.

[x ] My code follows the style guidelines of this project
[x ] I have performed a self-review of my code
[x ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation -> not needed
[ x] My changes generate no new warnings
[ ] I have added tests that prove my fix is effective or that my feature works -> not needed
[ x] General testing
- [ x] New and existing unit tests pass locally with my changes
- [ x] Coverage is >80%