Bug 17256 Exception due to bug 17208
bundles/org.eclipse.core.databinding/src/org/eclipse/core/databinding/conversion/ConvertDate2String.java
public Object convert(Object source) {
		if (source != null)
			return format((Date)source);
		return ""; 
	}
	public Object getFromType() {
		return Date.class;
	}
	public Object getToType() {
		return String.class;
	}	
}