Fix: idempotent setup and teardown

[angela-tran]

Closes #103

[thekaveman]

Nice find and nice simple fix 👍

In setup.py, should there be one more check to see if, when the table already exists, it still needs users to be loaded? Not sure if that's a use case that matters...

[angela-tran]

In setup.py, should there be one more check to see if, when the table already exists, it still needs users to be loaded? Not sure if that's a use case that matters...

I could see a case where maybe the IMPORT_FILE_PATH was wrong, and so the table was created but no data actually went into it. I'll add this check 👍

I think I'll also add a print statement for the case where data wasn't loaded.

[thekaveman]

Looks good!

Maybe a follow-up: figure out how to get the Python logging framework configured and replace the print statements with more appropriate log-level statements.