Fixed an exception occurring on right-click in Cy 3.10.3

Author: scaramonche

dist/ProteoVisualizer-0.0.2.jar

@@ -43,7 +43,9 @@ public boolean isReady(View<CyNode> nodeView, CyNetworkView networkView) {
 		CyNode groupNode = nodeView.getModel();
 		CyNetwork net = networkView.getModel();
 		// check if proteovis network and if group node
-		if (net != null && net.getRow(net).get(SharedProperties.COLLAPSED, Boolean.class)
+		if (net != null 
+				&& net.getRow(net).get(SharedProperties.COLLAPSED, Boolean.class) != null
+				&& net.getRow(net).get(SharedProperties.COLLAPSED, Boolean.class) 
 				&& groupManager.getGroup(groupNode, networkView.getModel()) != null)
 			return true;
 		return false;