Catch and log Configuration Key Coercion Failures

[HonzaR]

Is your feature request related to a problem? Please describe.

As a follow-up to #1372, configuration keys are coerced to their correct values from a string. These coercions produce exceptions, and we should catch and log them, at least.

Describe the solution you'd like

A similar issue is with preference lib, see #32

Alternatives you've considered

Additional context

We're safe here until we support any remote configuration from which an unexpected value could come.