[MacPorts] #57844: Warning message in buildbot port list

[MacPorts]

#57844: Warning message in buildbot port list
---------------------------+---------------------
 Reporter:  jmroot         |      Owner:  admin@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 https://build.macports.org/builders/ports-10.9_x86_64-watcher/builds/20963

 Notice the string `Warning: port "p5.28-image-exiftool" not found` in the
 port list on the subports step.

 Of course this means that some port incorrectly depends on the nonexistent
 port mentioned, but the message still shouldn't end up in the list. I'm
 not sure where the message is coming from. A quick grep for `port.*not
 found` didn't turn up anything with that phrasing and formatting in either
 base or mpbb.

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Ticket URL: <https://trac.macports.org/ticket/57844>
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