Fixes #1744

[peoe]

This pull request should fix issue #1744.

[codecov]

Codecov Report

Merging #1745 (7266345) into main (cd7ec2f) will decrease coverage by 5.77%.
The diff coverage is 50.00%.

Additional details and impacted files

Impacted Files	Coverage Δ
src/pymor/parameters/functionals.py	90.40% <50.00%> (-0.33%)	⬇️
src/pymordemos/neural_networks.py	0.00% <0.00%> (-96.43%)	⬇️
src/pymordemos/fenics_nonlinear.py	0.00% <0.00%> (-96.06%)	⬇️
src/pymor/models/neural_network.py	2.27% <0.00%> (-92.05%)	⬇️
src/pymordemos/neural_networks_fenics.py	0.00% <0.00%> (-91.55%)	⬇️
src/pymordemos/neural_networks_instationary.py	0.00% <0.00%> (-85.82%)	⬇️
src/pymor/reductors/neural_network.py	0.42% <0.00%> (-85.54%)	⬇️
src/pymortests/mpi_run_demo_tests.py	2.12% <0.00%> (-78.73%)	⬇️
src/pymor/discretizers/fenics/cg.py	0.00% <0.00%> (-75.87%)	⬇️
src/pymor/parallel/mpi.py	26.47% <0.00%> (-73.53%)	⬇️
... and 58 more

[sdrave]

Looks good, thanks!