`BlankLabelError` mistakenly use `rowNumbers` (plural) despite returning a single row number

[pierrecamilleri]

The BlankLabelError has a different API. Instead of rowNumber it has rowNumbers . Grepping the code I see that that's the only reference to rowNumbers and the docstring even suggest that it should be a value instead of a list. Is this an expected behavior of a bug?

• [ ] check that the code is aligned with documentation and that there is no edge case that needs to return several rowNumbers.