catch errors in sample network

contribs/application/src/main/java/org/matsim/application/prepare/network/SampleNetwork.java

@@ -193,7 +193,7 @@ public Integer call() throws Exception {
 
 		RandomizedTravelTime tt = new RandomizedTravelTime(rnd);
 
-		LeastCostPathCalculator router = createRandomizedRouter(network, tt);
+		LeastCostPathCalculator router = createRandomizedRouter(cityNetwork, tt);
 
 		sampleCityRoutes(cityNetwork, router, tt, rnd);
 
@@ -223,9 +223,16 @@ private void sampleCityRoutes(Network network, LeastCostPathCalculator router, R
 
 				Link to = NetworkUtils.getNearestLink(network, dest);
 
+				// Links could be on the very edge so that nodes are outside the network
+				if (to == null || !network.getNodes().containsKey(link.getFromNode().getId()) ||
+					!network.getNodes().containsKey(to.getToNode().getId())) {
+					i--;
+					continue;
+				}
+
 				LeastCostPathCalculator.Path path = router.calcLeastCostPath(link.getFromNode(), to.getToNode(), 0, null, null);
 
-				if (path.nodes.size() < 2) {
+				if (path == null || path.nodes.size() < 2) {
 					i--;
 					continue;
 				}