assert msg in EdcaTxopN::NotifyInternalCollision

[John Young]

I have tried to patch wifi module in ns 3 lbt and align it with ns3-dev 12385. Then I ran laa-wifi-indoor.cc with cellA wifi, cellB wifi, ftpModel1, 4 cells and 20 UEs per operator. After 20s, the assert msg appearred. Specifically, the location is 

void EdcaTxopN::NotifyInternalCollision (void)

{

.....

if (m_currentPacket == 0)

    {

      packet = m_queue->Peek (&header);

      NS_ASSERT_MSG (packet, "Internal collision but no packet in queue");

    }

...
}

And I hope it can be worked on at some time.