Handle config file path rename gracefully

[yezr]

RCTab Version: 1.3.999

What Happened

Saved a config file w/ some configuration options. Outside of RCTab, renamed the folder that the config file was in. Afterwards, back in RCTab, it seemed like anything that required a file picker wasn't working as expected

• I was unable to add new CVR. The "Select .xlsx" button clicked but no file selector showed up.
• I was also unable to save config to a different place. Clicking File -> Save seemed to do nothing, with no file picker showing up.
• I was unable to change the output location.

In each of these examples, the console did log some Java exceptions but no messages in the RCTab app logger.

Going to File -> Load does show an error, but clicking 'Don't Save' or 'Save' doesn't do anything. Cancel will close the modal. The error shows once per click of File -> Load. In this screenshot I clicked it twice.

What I Expect to Happen

If the expected location of the .config file doesn't exist I would expect it to be treated like a newly configured RCTab that hasn't had a .config saved or loaded yet.

Open Questions

• Any type of warning logged when we notice that the expected location doesn't exist anymore?