Improve the error message when a mapped column is not found in the CSV file. A new exception type 'MappedColumnNotFoundError' has been introduced for these cases.
Added additional tests to reproduce two different scenarios, the first when a mapped column is not found and the second and a non-mapped column is not found.
Improve the error message when a mapped column is not found in the CSV file. A new exception type 'MappedColumnNotFoundError' has been introduced for these cases.
Added additional tests to reproduce two different scenarios, the first when a mapped column is not found and the second and a non-mapped column is not found.
Related issue: https://github.com/dfurtado/dataclass-csv/issues/34