[chassis] show ip bgp summary fails on chassis linecards with no eBGP neighbors

[arlakshm]

Description

Steps to reproduce the issue

1. On a Linecard with no eBGP neighbors run the command show ip bgp summary

Describe the results you received

The command errors out with this error

admin@sonic:~$ show ip bgp summary

IPv4 Unicast Summary:
asic0: BGP router identifier 10.212.65.8, local AS number 64902 vrf-id 0
BGP table version 2303
asic1: BGP router identifier 10.212.65.9, local AS number 64902 vrf-id 0
BGP table version 2887
RIB entries 2696, using 496064 bytes of memory
Peers 18, using 13334544 KiB of memory
Peer groups 4, using 256 bytes of memory


Usage: show ip bgp summary [OPTIONS]
Try "show ip bgp summary -h" for help.

Error: peers missing in the bgp_summary 

Describe the results you expected

The command should not error but instead display output as below

autotest@sonic:~$ show ip bgp summary

IPv4 Unicast Summary:
asic0: BGP router identifier 192.0.0.1, local AS number 65100 vrf-id 0
BGP table version 11
asic1: BGP router identifier 192.0.0.2, local AS number 65100 vrf-id 0
BGP table version 12
RIB entries 0, using 0 bytes of memory
Peers 0, using 0 KiB of memory
Peer groups 0, using 0 bytes of memory


Neighbhor    V    AS    MsgRcvd    MsgSent    TblVer    InQ    OutQ    Up/Down    State/PfxRcd    NeighborName
-----------  ---  ----  ---------  ---------  --------  -----  ------  ---------  --------------  --------------

Total number of neighbors 0
autotest@sonic:~$

Additional information you deem important (e.g. issue happens only occasionally)

Output of show version

on 202205 image

(paste your output here)