working on route actions:

start block of route should only be freed, if corresponding action is fired.
  however, train should not be available from previous start block after route has finished.

src/main/java/de/srsoftware/web4rail/actions/FinishRoute.java

@@ -2,11 +2,14 @@ package de.srsoftware.web4rail.actions;
 
 import java.io.IOException;
 
+import de.srsoftware.web4rail.Route;
+
 public class FinishRoute extends Action {
 
 	@Override
 	public boolean fire(Context context) throws IOException {
-		context.route.finish();
+		Route route = context.route;
+		if (route != null) route.finish();
 		return true;
 	}
 }