QPID-3783 The AddressParser will now set the subject to Null if it equals to None. The only drawback is that if somebody wants to use a subject called "None" which is hard to imagine :) However even if they want to use such a subject it will not be easy to distinguish due to the fact we print null subjects as None.
qpid/trunk/qpid/java/common/src/main/java/org/apache/qpid/messaging/util/AddressParser.java