Fixes taboo topic checking without session username. #151
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Even though I don't completely understand the (undocumented) plugin system, I believe the topic-checking in the topic-taboo plugin is not implemented correctly and does not allow any topic subscriptions for anonymous sessions (without username).
This PR fixes at least this, and I don't dare to go further, but issues #145 and #129 are IMO spot on and basically prevent even the basic usage of hbmqtt broker as described in the current documentation.