fix: show error on invalid import

[betodealmeida]

SUMMARY

The current import API needs to raise an error if the user tries to import and invalid file.

Since we check which files are valid, I added a simple test to all import APIs:

if not contents:
    raise NoValidFilesFoundError()

Which returns an error message with a 400 HTTP status code.

I also took the time to SIP-41-fy the endpoints, removing the @safe decorator so exceptions can bubble up to the error handlers. Since the exceptions that the command can raise all have the correct HTTP status codes, this will preserve the existing behavior.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Tested manually with an invalid import.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API