Datagrid inline-editing - validation rules not fired when field is made blank

I don't want a value to be committed from an inline-editing action when the value is a blank. But how do I achieve that? Using validation-rules does not seem to work. Or I don't know how to set them right. I guess the underlying question is: "How can I influence the chain of events when an inline-editing change is being committed? How can I stop such a commit and make it rollback?"
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