[Buildbot] #2872: No error is reported when suppressionFile does not exist

[Buildbot trac]

#2872: No error is reported when suppressionFile does not exist
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Reporter:  wentasah  |       Owner:  MikeLing
    Type:  defect    |      Status:  assigned
Priority:  minor     |   Milestone:  0.8.x
 Version:            |  Resolution:
Keywords:  simple    |
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Comment (by dustin):

 Once you have a working master (basically, by following the tutorial), add
 a !WarningCountingShellCommand with a suppressionFile that does not exist,
 force a build, and see what happens :)

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Ticket URL: <http://trac.buildbot.net/ticket/2872#comment:12>
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