Handling empty attributes

[f-brinkmann]

Do we want to handle empty attributes in a certain way

• Raise a warning if attributes contain empty strings, maybe even an error for writing?

[ahms5]

are you thinking of the mandatory string fields or any string field?

[f-brinkmann]

For any string fields. It came up during a SOFA meeting. But I don't really feel like omplementing it - just wrote it down in case someone wants to tackle it...