Missing required sample sheet columns are filled in blank without triggering an error

[AmandaBirmingham]

Why is this just a warning? One consequence is that if you misspell a required column name, this fact will be silently ignored and a completely empty column with that name will be added to the sample sheet instead (?!) Surely this should be an error?

kl-metapool/metapool/sample_sheet.py

Lines 606 to 610 in a60c149

	for column in self._get_expected_data_columns():
	if column not in table.columns:
	warnings.warn('The column %s in the sample sheet is empty' %
	column)
	table[column] = ''

[antgonza]

The only reason that I would advocate for this to not be an error is to support old sample-sheets ... but I can also be convinced that we need to update those sample-sheets to comply with new requirements. Do you think it would be possible to raise an error that includes some kind of suggested value/entry?