UML2 (and ArgoPrint) : Tagged Value

Hi,
When I launch ArgoPrint with UML2, we have in file "$DiagramUtil.getMemberDescription" instead of "" for UML

The getTaggedValueValue return "" with UML1, but it return null with UML2

2 choices (I think): 
- Change the getTaggedValueValue in UML2
- Change Argoprint in order to have "" when null is return.


getTaggedValueValue is used in other module. So, do we need to change in all modules (if needed)
Is there a problem if we put "" instead of null ? (See comment: <> from UML1, but for null or for something else)


Class : org.argouml.model.euml

public String getTaggedValueValue(Object handle, String name) {
        // usage differs from UML1
        Object tv = getTaggedValue(handle, name);
        return tv != null ? tv.toString() : ""; //$NON-NLS-1$
    }

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