[cloud] Add DBName to RDS Facts if it exists (#27121)

* + Add DBName in RDS Facts if it's not null

* - remove 2 offending lines for automatic tests

* Syntax change for shorter code and improved readability

lib/ansible/modules/cloud/amazon/rds.py

@@ -780,7 +780,8 @@ class RDSDBInstance:
             d["endpoint"] = None
             d["port"] = None
             d["vpc_security_groups"] = None
-
+        if self.instance.DBName:
+            d['DBName'] = self.instance.DBName
         # ReadReplicaSourceDBInstanceIdentifier may or may not exist
         try:
             d["replication_source"] = self.instance.ReadReplicaSourceDBInstanceIdentifier
@@ -873,7 +874,8 @@ class RDS2DBInstance:
         else:
             d['endpoint'] = None
             d['port'] = None
-
+        if self.instance["DBName"]:
+            d['DBName'] = self.instance['DBName']
         return d