SSDM-5147 : Fix regression resulting from Skinny graph implementation

SVN: 38268

datastore_server/source/java/ch/ethz/sis/openbis/generic/server/dss/plugins/sync/common/entitygraph/EntityGraph.java

@@ -86,7 +86,7 @@ public class EntityGraph<N extends INode>
             }
         }
         EdgeNodePair enPair = new EdgeNodePair(edge, endNode);
-        // startNode.addConnection(enPair);
+        startNode.addConnection(enPair);
         adjacencyList.add(enPair);
         addNode(endNode);
     }