Config file with bad provider value fails with NPE and logging doesn't catch it

[HEdingfield]

If you load the attached config file in the latest build, the console shows an NPE, but the log file doesn't record it (I've included in the .zip both the log file and the console output for comparison).

Furthermore, the GUI seems to behave erratically after this has happened (unresponsive CVR Files table, etc.).

Note: The config file is clearly bad because it has "ES&S" as a provider, when it should now be "ess", as well as a few other differences. It also has the version "1.2.0_alpha", so the migration logic isn't triggered. However, even if I change the version to "TEST" or "1.1.0" and the migration logic is triggered, it appears to just freak out when encountering the "ES&S" value.

2013_minneapolis_mayor_config.zip

[HEdingfield]

The immediate problem is closed with #532. The problem of logs not picking up the NPE isn't resolved though, and I'm not sure if it's even possible. Might open a future issue on this...