Error Handling

[rgbkrk]

Bits for cleanup:

• [ ] Show loading state / progress
• [ ] When there is no discovery backend, API should possibly return

{
  results: [],
  error: "Message about the discovery backend not being connected"
}

• [ ] Handle S3 timeouts, errors, etc.
• [ ] Any other miscellaneous errors need to be logged as well as displayed for users