[MacPorts] #70903: port restore --last: process_cmd failed: can't read "variants": no such variable (was: `port restore --last` crashes while Computing dependency order)

[MacPorts]

#70903: port restore --last: process_cmd failed: can't read "variants": no such
variable
---------------------------+--------------------
  Reporter:  ShadSterling  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.10.1
Resolution:                |   Keywords:
      Port:                |
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Comment (by ryandesign):

 There's no crash; there's just an error message.

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Ticket URL: <https://trac.macports.org/ticket/70903#comment:1>
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