[MacPorts] #46327: cpan2port: fix exceptions

[MacPorts]

#46327: cpan2port: fix exceptions
---------------------+--------------------------------
 Reporter:  mojca@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  cpan2port
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 `cpan2port` sometimes fails to work, but I didn't yet figure out the
 pattern when that happens. Here's an example:

 {{{
 > cpan2port -t Astro
 (((can't expand Astro at /path/to/cpan2port line 149.
 ))) at /path/to/cpan2port line 353.
         main::foreach_pkg('CODE(0x7fac11003ce8)') called at
 /path/to/cpan2port line 378
 }}}

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Ticket URL: <https://trac.macports.org/ticket/46327>
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