[Buildbot] #2991: Confusing error message when the database is missing or empty

[Buildbot trac]

#2991: Confusing error message when the database is missing or empty
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Reporter:  sa2ajj            |       Owner:
    Type:  task              |      Status:  new
Priority:  patches-accepted  |   Milestone:  0.9.+
 Version:  0.8.9             |  Resolution:
Keywords:                    |
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Changes (by sa2ajj):

 * priority:  major => patches-accepted
 * type:  undecided => task
 * milestone:  undecided => 0.9.+


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Ticket URL: <http://trac.buildbot.net/ticket/2991#comment:3>
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