[MacPorts] #39149: ports querying registry for lua version fail to parse when lua is not installed

[MacPorts]

#39149: ports querying registry for lua version fail to parse when lua is not
installed
--------------------+----------------------------------------
 Reporter:  jmr@…   |      Owner:  and.damore@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.1.3
 Keywords:          |       Port:  lua-numlua luarocks luajit
--------------------+----------------------------------------
 {{{
 Failed to parse file devel/lua-numlua/Portfile: Registry error: lua not
 registered as installed & active.
 Failed to parse file devel/luarocks/Portfile: Registry error: lua not
 registered as installed & active.
 Failed to parse file lang/luajit/Portfile: Registry error: lua not
 registered as installed & active.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/39149>
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