Core fixes

[rozyczko]

minor fixes after recent changes in core, affecting tests mostly.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.07%. Comparing base (d660ffc) to head (8b7dc77).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easyreflectometry/project.py	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #288      +/-   ##
===========================================
- Coverage    88.65%   88.07%   -0.58%     
===========================================
  Files           45       45              
  Lines         2460     2458       -2     
  Branches       285      285              
===========================================
- Hits          2181     2165      -16     
- Misses         222      236      +14     
  Partials        57       57              

Flag	Coverage Δ
unittests	88.07% <94.11%> (-0.58%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/easyreflectometry/summary/summary.py	84.24% <100.00%> (+0.10%)	⬆️
src/easyreflectometry/project.py	77.66% <87.50%> (-0.44%)	⬇️

... and 1 file with indirect coverage changes

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