[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:
    Type:  defect    |     Status:  new
Priority:  minor     |  Milestone:  undecided
 Version:  0.8.9     |   Keywords:
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 When a ''WarningCountingShellCommand'' build step is created with
 ''suppressionFile'' keyword and the file referred by it cannot be
 accessed, this is not reported as an error. Instead, the step is run as if
 the suppressionFile is empty.

 It seems that steps/shell.py tries to handle errors in ''uploadFile''
 command, but this doesn't work.

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