As an User the Test Case Importer should return more useful error messages when the CSV format is wrong

As an User the Test Case Importer should return more useful error messages when the CSV format is wrong.
For instance:

1. If the separator is not correctly chosen
2. In case of other malformed situations, where it is returning the error "Second line (after header row) in CSV file is blank" which may not be the case.

The ideal, would be to have a format validator that would check and returned error messages telling the error and in which line and column it happens.