Allowing getMatchFieldMask, getDataLayerType, getNetworkProtocol, getTransportSource, getTransportDestination calls to return zero or null, instead of throwing an exception.
Allowing getMatchFieldMask, getDataLayerType, getNetworkProtocol, getTransportSource, getTransportDestination calls to return zero or null, instead of throwing an exception.

rcchan/cs168-sdn-floodlight,rcchan/cs168-sdn-floodlight,drinkwithwater/floodlightplus,rcchan/cs168-sdn-floodlight,drinkwithwater/floodlightplus,drinkwithwater/floodlightplus,rcchan/cs168-sdn-floodlight,rcchan/cs168-sdn-floodlight,drinkwithwater/floodlightplus