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Sub-task
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Resolution: Cannot Reproduce
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Neutral
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Apparently option groups throws exception from data model.
Caused by: com.vaadin.data.util.converter.Converter$ConversionException: Unable to convert value of type java.lang.String to presentation type interface java.util.Set. No converter is set and the types are not compatible.
at com.vaadin.data.util.converter.ConverterUtil.convertFromModel(ConverterUtil.java:98)
at com.vaadin.ui.AbstractField.convertFromModel(AbstractField.java:705)
at com.vaadin.ui.AbstractField.convertFromModel(AbstractField.java:690)
at com.vaadin.ui.AbstractField.setPropertyDataSource(AbstractField.java:626)