Failing to Catch Validation Errors

[mekhlakapoor]

Describe the bug
The metadata service is returning the message Valid Model even for models that are expected to have validation errors (for ex when required fields are missing). Issue caught by @saskiad

To Reproduce
service returns "valid model" when required fields are missing
eg. http://aind-metadata-service/procedures/653980
This says the model is valid but there is no injection_volume field, which is a required field.
Expected behavior
should catch the validation errors for each of the procedure models and include that in message.

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Additional context
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