RT-7.1 Panic issue fix

[shpaulch]

In cases where either IPv4 address is nil or IPv6 address is nil, panic happens. Nil check works only if both ipv4 and ipv6 address are nil. Changed nil check to config interface if wither IPv4 or IPv6 address is nil

[OpenConfigBot]

Pull Request Functional Test Report for #4674 / 7254e5fdc223503fd795d1fcbaae1d1f22472c11

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Cisco 8000E		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Cisco XRd		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Juniper ncPTX		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Nokia SR Linux		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Openconfig Lemming		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Cisco 8808		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Juniper PTX10008		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE
Nokia 7250 IXR-10e		P4RT-5.3: Traceroute: PacketIn With VRF Selection RT-7.1: BGP default policies TE-16.2: encapsulation FRR scenarios TE-16.3: encapsulation FRR scenarios TE-17.1: VRF selection policy driven TE

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