[MacPorts] #59445: restore_ports.tcl: fail with a better message in case of dependency cycle

[MacPorts]

#59445: restore_ports.tcl: fail with a better message in case of dependency cycle
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  Reporter:  JDLH         |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  contrib      |    Version:  2.6.2
Resolution:               |   Keywords:
      Port:               |
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Comment (by cooljeanius):

 I have a pull request open to address this; it doesn't fully fix it
 though: https://github.com/macports/macports-contrib/pull/10

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Ticket URL: <https://trac.macports.org/ticket/59445#comment:9>
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