[MacPorts] #60612: bootstrap.sh fails when creating port index

[MacPorts]

#60612: bootstrap.sh fails when creating port index
----------------------------+---------------------
 Reporter:  nickgaya        |      Owner:  admin@…
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  server/hosting  |    Version:
 Keywords:                  |       Port:
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 Travis / AzureCI builds are failing for a recently created PR, seemingly
 unrelated to my changes.

 Example: https://travis-ci.org/github/macports/macports-
 ports/jobs/695593852

 {{{
 Creating port index in /Users/travis/build/macports/macports-ports
 Failed to parse file gnome/virt-manager/Portfile: Registry error: gtk2 not
 registered as installed & active.
 Adding port print/ghostscript
 Adding port print/ghostscript-fonts-hiragino

 Total number of ports parsed:   3
 Ports successfully parsed:      2
 Ports failed:                   1
 Up-to-date ports skipped:       23825

 The command "./_ci/bootstrap.sh" failed and exited with 2 during .
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60612>
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