Merge pull request #122 from TomMarkuske/master

Fix NPE on incoming DataTransferRequest

Author: TVolden

ocpp-v1_6/src/main/java/eu/chargetime/ocpp/feature/profile/ClientCoreProfile.java

@@ -60,7 +60,7 @@ public ClientCoreProfile(ClientCoreEventHandler handler) {
     features.add(new ChangeAvailabilityFeature(this));
     features.add(new ChangeConfigurationFeature(this));
     features.add(new ClearCacheFeature(this));
-    features.add(new DataTransferFeature(null));
+    features.add(new DataTransferFeature(this));
     features.add(new GetConfigurationFeature(this));
     features.add(new HeartbeatFeature(null));
     features.add(new MeterValuesFeature(null));