Fix crash when dealing with IBs where m_skip==true #129
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This is a case where m_start_node_stack assumes that packets exist in every IB, which is obviously not true for IBs that are "skipped". No packets get pushed on that stack, and then it gets popped at the end of OnIbEnd(). This causes a crash later. Fixed by using the m_new_ib_start flag to determine if any packets were pushed onto the stack, and not doing any of the usual things if nothing is pushed.