v2 - Fix incorrectTypeForFlagError for pointers

[danhunsaker]

What type of PR is this?

• bug

What this PR does / why we need it:

When configs parsed into MapInputSource are looked up, they report type mismatch errors, as expected. However, if the type is mismatched because it somehow ended up becoming a pointer, the error message doesn't actually indicate this. Instead, it reports an "actual type" of '' - the empty string. This is a known limitation of the way reflect works, and is used elsewhere in the code to dereference the pointer to get the actual type. So I'm not sure why it was overlooked in this case.

Testing

A test was added to ensure this change works as expected.

Release Notes

NONE

[danhunsaker]

I'll do a v3 version of this if needed once v3 supports configuration files.

[danhunsaker]

Further exploration reveals this is inaccurate. I need to figure out what type I actually get and provide a fix that way. Closing until then.