Fixing DELETE delivery service request comments getting null xml_id (#7664)

traffic_ops/traffic_ops_golang/deliveryservice/request/comment/comments.go

diff --git a/traffic_ops/traffic_ops_golang/deliveryservice/request/comment/comments.go b/traffic_ops/traffic_ops_golang/deliveryservice/request/comment/comments.go
index 19d761c..b4e119d 100644
--- a/traffic_ops/traffic_ops_golang/deliveryservice/request/comment/comments.go
+++ b/traffic_ops/traffic_ops_golang/deliveryservice/request/comment/comments.go
@@ -176,7 +176,7 @@
 a.username AS author,
 dsrc.author_id,
 dsrc.deliveryservice_request_id,
-dsr.deliveryservice->>'xmlId' as xml_id,
+COALESCE(dsr.deliveryservice->>'xmlId', dsr.original->>'xmlId') as xml_id,
 dsrc.id,
 dsrc.last_updated,
 dsrc.value