IAState No Data Handling

[jrleeman]

When requesting an invalid date/station from IAState upper air our handler doesn't catch correctly. Not sure if it was a change on their end or if it didn't work right. (We didn't test that case in MetPy since we didn't have VCR).

• Fix IA State handling (it's just a blank return with a 200)
• Add tests for both services

[jrleeman]

@akrherz If you request upper air data that's not available we get a sensible JSON return. If we request data from the future accidentally, there's just a blank page with a 200. Any chance to get either the JSON return or a 404?

[akrherz]

@jrleeman thanks for reaching out, any happier now?

[jrleeman]

That'll work! 👍 Thanks for the quick response.