error output in notebookes is no longer detected by CI

[slayoo]

example here: https://github.com/open-atmos/PySDM/pull/1665/files#diff-49afafc5a3864c1d4f59bedce3c5db2f941ab3f692016f731b544b98c4f786f4

[AgnieszkaZaba]

@slayoo could you point out the exact spot of the error? In copula_hello? I can't locate it hmm

[slayoo]

https://github.com/open-atmos/PySDM/blob/89488a667547e367e4a9d4f3f97cf7a137a6f4cd/examples/PySDM_examples/Arabas_et_al_2025/copula_hello.ipynb

This is fixed in the PR branch in a later commit, but even before the fix, CI was all green