Remove undef use in add_indom call in Perl version of simple PMDA.
Remove undef use in add_indom call in Perl version of simple PMDA.

andyvand/cygpcpfans,aeg-aeg/pcpfans,aeg-aeg/pcpfans,prasincs/pcp,wuliming/pcp,tjanez/pcp,adfernandes/pcp,prasincs/pcp,edwardt/pcp,ryandoyle/pcp_original,prasincs/pcp,ryandoyle/pcp_original,adfernandes/pcp,andyvand/cygpcpfans,prasincs/pcp,edwardt/pcp,mbaldessari/pcp,prasincs/pcp,prasincs/pcp,andyvand/cygpcpfans,wuliming/pcp,aeg-aeg/pcpfans,wuliming/pcp,wuliming/pcp,aeg-aeg/pcpfans,tjanez/pcp,wuliming/pcp,ryandoyle/pcp_original,aeg-aeg/pcpfans,tjanez/pcp,adfernandes/pcp,aeg-aeg/pcpfans,edwardt/pcp,tjanez/pcp,ryandoyle/pcp_original,adfernandes/pcp,edwardt/pcp,wuliming/pcp,prasincs/pcp,mbaldessari/pcp,tjanez/pcp,mbaldessari/pcp,wuliming/pcp,mbaldessari/pcp,wuliming/pcp,tjanez/pcp,mbaldessari/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,adfernandes/pcp,ryandoyle/pcp_original,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,prasincs/pcp,edwardt/pcp,mbaldessari/pcp,ryandoyle/pcp_original,edwardt/pcp,andyvand/cygpcpfans,ryandoyle/pcp_original,adfernandes/pcp,tjanez/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,ryandoyle/pcp_original,adfernandes/pcp