[Buildbot] #3467: check for potential "No sourcestamp found in build for codebase '...'" errors during configuration parsing

[Buildbot trac]

#3467: check for potential "No sourcestamp found in build for codebase '...'"
errors during configuration parsing
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Reporter:  rutsky     |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.9.0b7    |   Keywords:
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 I think `No sourcestamp found in build for codebase '...'` when using
 multiple-codebase-builds is relatively popular error (e.g. when Source
 Step doesn't have properly configured `codebase`).

 Perhaps this issue be checked during configuration parsing step?

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Ticket URL: <http://trac.buildbot.net/ticket/3467>
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