CLN: Improve Exceptions in core/common, io/excel and core/format #4721
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Related to #3954.
Cleanups to Exceptions in core/common, io/excel, core/format. A few places I added
# pragma: no cover
, because it looked like the code was generally unreachable. A few cleanups in tests/test_common and better error message in_mut_exclusive
(which needs to be used in Panel.reindex later on).Specific places to look at (you can also grep for
# pragma: no cover
in the diff):