[MacPorts] #72087: port diagnose fails with missing directory

[MacPorts]

#72087: port diagnose fails with missing directory
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 Reporter:  matty0ung  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.10.5
 Keywords:             |       Port:
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 Running `sudo port diagnose --quiet` yields the following error:

 `process_cmd failed: could not read "/opt/local/var/macports/incoming": no
 such file or directory`

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Ticket URL: <https://trac.macports.org/ticket/72087>
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