[System Test][UI] XDCR Errors displaying just the timestamp and no message body

7.0.0-4955

Test:
-test tests/integration/cheshirecat/test_cheshirecat_kv_gsi_coll_xdcr_backup_sgw_fts_itemct_txns_eventing_cbas_scale3.yml -scope tests/integration/cheshirecat/scope_cheshirecat_with_backup.yml
Scale 3
Iteration 2

Please find screenshot attached - errors displayed in UI with just timestamps and no message body - around these timestamps, I don't see any error in the logs though

Logs collected around these timestamps:

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url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1618798200/collectinfo-2021-04-19T021004-ns_1%40172.23.104.67.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1618798200/collectinfo-2021-04-19T021004-ns_1%40172.23.104.69.zip
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