Fixed potential NPE for some Bypass Evaluations w/o Vis

src/de/tud/kom/p2psim/impl/topology/views/VisualizationTopologyView.java

@@ -519,6 +519,9 @@ public class VisualizationTopologyView extends JFrame
 	 * @version 1.0, 03.04.2012
 	 */
 	public static class VisualizationInjector {
+		
+		private static boolean isActive = false;
+		
 		protected static WorldPanel worldPanel;
 
 		public static ComponentVisManager visManager;
@@ -588,6 +591,7 @@ public class VisualizationTopologyView extends JFrame
 			VisualizationInjector.visManager = visManager;
 			VisualizationInjector.WORLD_X = WORLD_X;
 			VisualizationInjector.WORLD_Y = WORLD_Y;
+			VisualizationInjector.isActive = true;
 
 			for (VisInfo visInfo : components) {
 				visManager.addComponent(visInfo);
@@ -598,6 +602,14 @@ public class VisualizationTopologyView extends JFrame
 
 			setupAWTEventListener();
 		}
+		
+		/**
+		 * True if this component is active at all (can be used)
+		 * @return
+		 */
+		public static boolean isActive() {
+			return isActive;
+		}
 
 		public static VisualizationTopologyView getTopologyView() {
 			return view;
@@ -800,6 +812,9 @@ public class VisualizationTopologyView extends JFrame
 		 * @param comp
 		 */
 		public static void injectComponent(VisualizationComponent comp) {
+			if (!isActive()) {
+				return;
+			}
 			visManager.addComponent(comp);
 		}