Extract ValidationError error message from pydantic and format it nicely #109
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Description
As per this comment](#107 (comment)) I saw that the errors were not always being handled gracefully in notebooks.
These changes lead to simple error messages such as:
As you can see from the change in src/pyetm/models/scenarios.py, because the errors are already well formed, plural classes (e.g. Scenarios) need only surface the errors when calling underlying singular class methods (e.g. Scenario.load()). That probably requires further examination/testing to see which cases might be rending error messages twice.