Context:

• ConfigurationWidget uses ConfigurationAdapter to fill in defaults.
• ConfigurationAdapter uses stored config (see Implement file-backed config store for dashboard persistence #524 for example) to validate a Pydantic model.
• If workflow params change in an incompatible way we should increment the workflow version to avoid problems.
• But that may not reflect reality, i.e., we may have incompatible config that cannot be parsed any more.

Solution:

• Ensure we catch exceptions from Pydantic model validation on config (use workflow defaults instead, as if there was no stored config).
• Consider if we can or should clear the bad config, or just rely on it being overwritten?