QGis2.8 ValueMap: Why is the first row of my ComboBox empty?

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I define a field of a vector layer as ValueMap. I define the values manually, then the feature attribute dialog appears with the combobox. But the first row in my combobox is empty. I use QGis2.8. In QGis2.0 the first row was not empty.

Why is the first row of my ComboBox empty? If I click "ok" immediately without using the combobox I get a strange character () in the attribut tablel.

Regards



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