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Revision 7025

do not allow blank node references to be used.
https://redmine.dataone.org/issues/2362

+        }
         /**
          * Extract a List of NodeReferences froma String listing the node identifiers where
          * Extract a List of NodeReferences from a String listing the node identifiers where
          * each identifier is separated by whitespace, comma, or semicolon characters.
          * @param nodeString the string containing the list of nodes
          * @return the List of NodeReference objects parsed fromt he input string
          * @return the List of NodeReference objects parsed from the input string
          */
         private static List<NodeReference> extractNodeReferences(String nodeString) {
             List<NodeReference> nodeList = new ArrayList<NodeReference>();
             String[] result = nodeString.split("[,;\\s]");
             for (String r : result) {
                 NodeReference noderef = new NodeReference();
                 noderef.setValue(r);
                 nodeList.add(noderef);
             	if (r != null && r.length() > 0) {
     	            NodeReference noderef = new NodeReference();
     	            noderef.setValue(r);
     	            nodeList.add(noderef);
+    	        }
+            }
             return nodeList;
+        }

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