I'm using pcapy to scan a packet capture file.  I've tried a variety of
tests to end the loop at EOF, but can't seem to avoid the program
terminating with a pcapy.PcapError.  I've tested for empty lists (while
Raw == [] or Passed == []:) and strings (while Raw ==""] or Passed ==
"":) as well as the test in the sample below.

while Raw and Passed :
        if Raw_IP != Passed_IP:
                Dropped.dump(Raw_hdr, Raw_data)
        else:
                Passed_hdr, Passed_data = Passed.next()
        Raw_hdr, Raw_data = Raw.next()


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