ERR lldp#lldpmgrd[32]: unknown operation error log is seen during breakout tests

[vivekrnv]

Description

When a redis event quickly gets outdated during port breakout, error logs like this are seen

Describe the results you received:

Mar  8 01:43:26.011724 r-leopard-56 INFO ConfigMgmt: Write in DB: {'PORT': {'Ethernet64': {'admin_status': 'down'}, 'Ethernet68': {'admin_status': 'down'}}}
Mar  8 01:43:26.012565 r-leopard-56 INFO ConfigMgmt: Writing in Config DB
Mar  8 01:43:26.013468 r-leopard-56 INFO ConfigMgmt: Write in DB: {'PORT': {'Ethernet64': None, 'Ethernet68': None}, 'INTERFACE': None}
Mar  8 01:43:26.018095 r-leopard-56 NOTICE swss#portmgrd: :- doTask: Configure Ethernet64 admin status to down
Mar  8 01:43:26.018309 r-leopard-56 NOTICE swss#portmgrd: :- doTask: Delete Port: Ethernet64
Mar  8 01:43:26.018641 r-leopard-56 NOTICE lldp#lldpmgrd[32]: :- pops: Miss table key PORT_TABLE:Ethernet64, possibly outdated
Mar  8 01:43:26.018654 r-leopard-56 ERR lldp#lldpmgrd[32]: unknown operation ''

Describe the results you expected:

Error Log should not be seen