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.