Merge "Add null pointer check for mConfig in onSessionLost"

                // prevent the NetworkManagementEventObserver from killing this VPN based on the

                // interface going down (which we expect).

                mInterface = null;

                if (mConfig != null) {

                    mConfig.interfaze = null;

                    // Set as unroutable to prevent traffic leaking while the interface is down.

                if (mConfig != null && mConfig.routes != null) {

                    if (mConfig.routes != null) {

                        final List<RouteInfo> oldRoutes = new ArrayList<>(mConfig.routes);

                        mConfig.routes.clear();

                        for (final RouteInfo route : oldRoutes) {

                        mConfig.routes.add(new RouteInfo(route.getDestination(), null /*gateway*/,

                                null /*iface*/, RTN_UNREACHABLE));

                            mConfig.routes.add(new RouteInfo(route.getDestination(),

                                    null /*gateway*/, null /*iface*/, RTN_UNREACHABLE));

                        }

                        if (mNetworkAgent != null) {

                            mNetworkAgent.sendLinkProperties(makeLinkProperties());

                        }

                    }

                }

            }

            resetIkeState();

        }