RandomData: Don't crash on intermediatelly valid input

biolab / orange3-educational

🍊 🎓 Educational widgets for machine learning and data mining in Orange 3.

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Closed janezd closed 3 years ago

janezd commented 3 years ago

Fixes #117.

Show an error in case of invalid (intermediate) value.
A few other minor changes, mostly refactoring for easier handling of additional error messages.