* fix: catch AttributeError in validate_data for non-DataFrame Union types
PUT /v1/prediction/import/{provider_id} crashed with AttributeError
when Union validator tried PydanticDateTimeDataFrame validation on
scalar float/int values. Instead of falling through to DateTimeData
or dict, the exception propagated as 500. Fixes#992.
* fix: correct indentation of ValueError in validate_data
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Co-authored-by: Normann <github@koldrack.com>
