Fix configobj to relay tuple type errors

[brandonpayton]

Some current config tuple checking is of the form:

if not isinstance(value[1], int) or not isinstance(value[2], int):
    VdtTypeError(value)

This has two problems. The first is that isinstance('123', int) is always False, which means the if's block always runs. A VdtTypeError would always be raised except that the raise keyword is missing.

This PR attempts to fix that issue.

[lucc]

This width_tuple function looks quite simple. Do you mind adding some tests to tests/utils/test_configobj.py? Preferably also for the error handling that you improved (i.e. asserting that the right exceptions are thrown).

[brandonpayton]

I committed some tests but need to break them into smaller pieces and add one or two more.

[brandonpayton]

Thanks also for taking a look at this.

[brandonpayton]

OK, I added some width_tuple tests, made the raised exceptions more precise, and consolidated the exception handling. This should be ready for another look.

[lucc]

The code itself looks good. I suggest breaking the test cases up into individual functions so that each function checks exactly "one thing".

[brandonpayton]

That is much cleaner. Thank you!

[lucc]

Thank you for your contribution 👍