[ns] problem with "remove-all-packet-headers"

[Laurent Silvio Ciavaglia <laurent.ciavaglia@alcatel.fr>]

Hello,

I have tried to use the remove-all-packet_headers function in
ns-packet.tcl but ns exits complaining :

can't unset "tab_(PacketHeader/Pushback)": no such element in array
    (Object unset line 2)
    invoked from within
"PacketHeaderManager unset tab_($cl)"
    (procedure "remove-all-packet-headers" line 4)
    invoked from within
"remove-all-packet-headers"

When I use remove-packet-header with all the header listed individually
it works.
Anybody has a clue ?

Regards, Laurent.
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