[MacPorts] #57613: port @ 2.5.4: diagnose command gives error about installed Xcode version

[MacPorts]

#57613: port @ 2.5.4: diagnose command gives error about installed Xcode version
-------------------------+--------------------
  Reporter:  hardingliu  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.5.99
Resolution:              |   Keywords:
      Port:              |
-------------------------+--------------------
Changes (by mf2k):

 * keywords:  mojave =>
 * version:  2.5.4 => 2.5.99


Comment:

 This also happens for me on High Sierra with Xcode 10.1 and the latest
 base from git.

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Ticket URL: <https://trac.macports.org/ticket/57613#comment:1>
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