`RecommendedCutoffMixin`: improve error messages

aiidateam / aiida-pseudo

MIT License

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Closed mbercx closed 3 years ago

mbercx commented 3 years ago

Fixes #84 Fixes #85

Improve the error message in two cases:

When deleting the final stringency with the delete_cutoffs method.
An element requested with the get_recommended_cutoffs method does not have a pseudo in the pseudo family.