dagrun_operator in Airflow Version 1.10.10 ERROR - No row was found for one() _run_raw_task result = task_copy.execute(context=context)

[SHANIT]

On Migrating Airflow from V1.10.2 to V1.10.10 One of our DAG have a task which 
is of dagrun_operator type.
The DAG runs all fine. In fact the python callable of the task mentioned until 
the last line. Then it errors out.
It errors out

```
[2020-06-09 11:36:22,838] {taskinstance.py:1145} ERROR - No row was found for 
one()
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/airflow/models/taskinstance.py", 
line 983, in _run_raw_task
    result = task_copy.execute(context=context)
  File 
"/usr/local/lib/python3.6/site-packages/airflow/operators/dagrun_operator.py", 
line 95, in execute
    replace_microseconds=False)
  File 
"/usr/local/lib/python3.6/site-packages/airflow/api/common/experimental/trigger_dag.py",
 line 141, in trigger_dag
    replace_microseconds=replace_microseconds,
  File 
"/usr/local/lib/python3.6/site-packages/airflow/api/common/experimental/trigger_dag.py",
 line 98, in _trigger_dag
    external_trigger=True,
  File "/usr/local/lib/python3.6/site-packages/airflow/utils/db.py", line 74, 
in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/airflow/models/dag.py", line 
1471, in create_dagrun
    run.refresh_from_db()
  File "/usr/local/lib/python3.6/site-packages/airflow/utils/db.py", line 74, 
in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/airflow/models/dagrun.py", line 
109, in refresh_from_db
    DR.run_id == self.run_id
  File "/usr/local/lib64/python3.6/site-packages/sqlalchemy/orm/query.py"
```

Details of this is also posted at https://github.com/apache/airflow/issues/9197