More progress on CCNx stack. Now we have helpers. Everything compiles, but not yet working

diff --git a/model/ccnx-local-face.cc b/model/ccnx-local-face.cc
index aeb2002..d5de90f 100644
--- a/model/ccnx-local-face.cc
+++ b/model/ccnx-local-face.cc
@@ -21,7 +21,6 @@
 
 #include "ccnx-local-face.h"
 
-#include "ns3/ccnx-address.h"
 #include "ns3/ccnx-l3-protocol.h"
 #include "ns3/net-device.h"
 #include "ns3/log.h"
@@ -70,17 +69,15 @@
 void 
 CcnxLocalFace::SetDevice (Ptr<NetDevice> device)
 {
-  assert (false);
+  NS_ASSERT_MSG (false, "It is impossible to set device to LocalFace");
 }
 
 Ptr<NetDevice>
 CcnxLocalFace::GetDevice (void) const
 {
-  assert (false)
+  return 0;
 }
 
-
-
 void
 CcnxLocalFace::Send (Ptr<Packet> p)
 {