Fix update-ports when pmap_dump omits program name

The error was

    Traceback (most recent call last):
      File "/usr/lib/pov-server-page/update-ports", line 295, in <module>
        main()
      File "/usr/lib/pov-server-page/update-ports", line 289, in main
        portmap_data = list(pmap_dump())
      File "/usr/lib/pov-server-page/update-ports", line 108, in pmap_dump
        program = parts[4]
    IndexError: list index out of range
Release 0.14.1