[tor-bugs] #25422 [Applications/rbm]: Give more details in "Cannot checkout" errors

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#25422: Give more details in "Cannot checkout" errors
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     Reporter:  boklm             |      Owner:  boklm
         Type:  task              |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Applications/rbm  |    Version:
     Severity:  Normal            |   Keywords:  tbb-rbm, boklm201803
Actual Points:                    |  Parent ID:
       Points:                    |   Reviewer:
      Sponsor:                    |
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 Our nightly build sometimes fail with an error such as:
 {{{
 Error: Cannot checkout tor-browser-52.6.0esr-8.0-2-build2
 }}}

 We should print the stderr output from the git/hg command to give more
 details about the error.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25422>
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