[MacPorts] #72689: port command inoperable after failed upgrade to 2.11.1

[MacPorts]

#72689: port command inoperable after failed upgrade to 2.11.1
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  Reporter:  McDutchie  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.11.1
Resolution:             |   Keywords:
      Port:             |
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Comment (by jmroot):

 Replying to [comment:12 ryandesign]:
 > In the case of that buildbot worker, 2.11.1 did get installed despite
 the error:

 Right, it only failed when it got to the post-installation scripts (which
 fortunately are probably OK to skip for this update). Interesting that
 unlike for the ticket reporter, `port` is working afterwards.

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Ticket URL: <https://trac.macports.org/ticket/72689#comment:13>
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