[MacPorts] #53445: port:mlt/mlt-qt5 fixes

[MacPorts]

#53445: port:mlt/mlt-qt5 fixes
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  Reporter:  RJVB         |      Owner:  ddennedy
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:  haspatch maintainer
      Port:  mlt          |
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Comment (by RJVB):

 Doh, the pkg-config invocation has to be wrapped in a `catch` call,
 clearly.

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Ticket URL: <https://trac.macports.org/ticket/53445#comment:9>
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