Show warning banner when database isn't configured #56
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This pull request prevents an error from occuring when the Importer can't connect to the app's database (for example: when the SQLite database file hasn't been created).
Instead of seeing an error as soon as you go to the edit page, you'll now see a banner asking you to migrate your database, which will let you configure your application's database:
You'll only be able to run the import after migrating the database tables.
Combined with recent updates to the docs, these changes should make the next steps a little more obvious when you're running into database-related errors.
Related: #55