Re: Schema checking did not allow optional attributes (ITS#3889)

[cjones@simdesk.com]

Pierangelo Masarati wrote:

>The suggested change looks incorrect; in fact, it must never occur that the
>a_vals member is non-null but no value is present.  Actually, it only occurred
>in the case indicated by (ITS#3861), so that issue could be correctly tracked
>down.  This change should be rejected.
>  
>
In actual testing, I've run into the case were a_vals is non-null but 
contains 0 items in the case of an optional attribute.  Perhaps a change 
upstream of the point in the patch would be more appropriate.