[MacPorts] #53335: `port outdated` seems to fail on macOS Sierra, 10.12.2

[MacPorts]

#53335: `port outdated` seems to fail on macOS Sierra, 10.12.2
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  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.3.5
Resolution:             |   Keywords:  sierra
      Port:             |
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Comment (by ballapete):

 Replying to [comment:1 ryandesign]:
 > Does `port installed` work? If so, can you show us its output?

 Yes, it does! It lists over 300 active packages.

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Ticket URL: <https://trac.macports.org/ticket/53335#comment:2>
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