Fix serialization of anonymous nodes with no incoming arcs.
Fixes #139, sz.incoming[subject] is undefined during Dublin Core Unqualified RDF export
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@ -758,7 +758,7 @@ $rdf.Serializer = function () {
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var attrs = '';
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if(subject.termType == 'bnode') {
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if(sz.incoming[subject].length != 1) { // not an anonymous bnode
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if(!sz.incoming[subject] || sz.incoming[subject].length != 1) { // not an anonymous bnode
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attrs = ' rdf:nodeID="' + subject.toNT().slice(2) + '"';
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}
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} else {
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