[Buildbot] #3451: tests running with MySQL backend produces suspicious warnings

[Buildbot trac]

#3451: tests running with MySQL backend produces suspicious warnings
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Reporter:  rutsky     |       Owner:
    Type:  undecided  |      Status:  new
Priority:  major      |   Milestone:  0.9.+
 Version:  master     |  Resolution:
Keywords:             |
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Comment (by rutsky):

 Looks like `can't have a default value` is warning on Linux and fatal
 error on Windows: http://stackoverflow.com/a/4553664/391865

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Ticket URL: <http://trac.buildbot.net/ticket/3451#comment:2>
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