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Merge pull request #2829 from minrk/nodate...
Merge pull request #2829 from minrk/nodate avoid comparison error in dictdb hub history in rare situations, display data can arrive at the Hub before the execution request, in which case `submitted` is undefined. should address #2821, but I need to see Jenkins succeed, since that is the only place this comes up.

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logtopics.rst
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute