Remove unneeded attribution in ASN1F_optional (which caused Python 2.6 to crash)

scapy/asn1fields.py

@@ -375,7 +375,7 @@ class ASN1F_optional(ASN1F_field):
         self.name = field.name
         self.islist = field.islist
         self.holds_packets = field.holds_packets
-        self.i2repr = field.i2repr
+        #self.i2repr = field.i2repr
     def __getattr__(self, attr):
         return getattr(self._field, attr)
     def m2i(self, pkt, s):