pimd: "show ip mroute" skips entries without an OIF

pimd: "show ip mroute" skips entries without an OIF

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>
The entry for 230.10.10.4 was not being displayed

root@superm-redxp-05[pimd]# ip mroute show
(20.0.13.253, 230.10.10.4)       Iif: br1
(20.0.13.253, 230.10.10.1)       Iif: br1        Oifs: swp1
root@superm-redxp-05[pimd]#

root@superm-redxp-05[pimd]#
root@superm-redxp-05[pimd]# vtysh -c 'show ip mroute'
Proto: I=IGMP P=PIM S=STATIC O=SOURCE

Source          Group           Proto Input iVifI Output oVifI TTL Uptime
20.0.13.253     230.10.10.1     P     br1       1 swp1       2   1 00:01:09
20.0.13.253     230.10.10.4     P     br1       1 none       0   0 --:--:--
root@superm-redxp-05[pimd]#