### Apache Airflow version

2.2.0b1 (beta snapshot)

### Operating System

Linux (`5.13.13-zen1-1-zen #1 ZEN SMP PREEMPT Thu, 26 Aug 2021 19:14:35 +0000 x86_64 GNU/Linux`)

### Versions of Apache Airflow Providers

<details><summary> pip freeze | grep apache-airflow-providers</summary> 
apache-airflow-providers-amazon==2.1.0<br>
apache-airflow-providers-celery==2.0.0<br>
apache-airflow-providers-cncf-kubernetes==2.0.1<br>
apache-airflow-providers-docker==2.1.0<br>
apache-airflow-providers-elasticsearch==2.0.2<br>
apache-airflow-providers-ftp==2.0.0<br>
apache-airflow-providers-google==5.0.0<br>
apache-airflow-providers-grpc==2.0.0<br>
apache-airflow-providers-hashicorp==2.0.0<br>
apache-airflow-providers-http==2.0.0<br>
apache-airflow-providers-imap==2.0.0<br>
apache-airflow-providers-microsoft-azure==3.1.0<br>
apache-airflow-providers-mysql==2.1.0<br>
apache-airflow-providers-postgres==2.0.0<br>
apache-airflow-providers-redis==2.0.0<br>
apache-airflow-providers-sendgrid==2.0.0<br>
apache-airflow-providers-sftp==2.1.0<br>
apache-airflow-providers-slack==4.0.0<br>
apache-airflow-providers-sqlite==2.0.0<br>
apache-airflow-providers-ssh==2.1.0<br>
</details>

### Deployment

Docker-Compose

### Deployment details

Docker Image: apache/airflow:2.2.0b1-python3.8

```shell
$ docker version
Client:
 Version:           20.10.8
 API version:       1.41
 Go version:        go1.16.6
 Git commit:        3967b7d28e
 Built:             Wed Aug  4 10:59:01 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          20.10.8
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.6
  Git commit:       75249d88bc
  Built:            Wed Aug  4 10:58:48 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v1.5.5
  GitCommit:        72cec4be58a9eb6b2910f5d10f1c01ca47d231c0.m
 runc:
  Version:          1.0.2
  GitCommit:        v1.0.2-0-g52b36a2d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0
```

```shell
$ docker-compose version
docker-compose version 1.29.2, build unknown
docker-py version: 5.0.2
CPython version: 3.9.6
OpenSSL version: OpenSSL 1.1.1l  24 Aug 2021
```

### What happened

I've tested current project for compatibility to migrate to 2.2.x in the future.

As soon as i tried to access from UI to Task Instance Details or Rendered Template for DAG _which never started before_ I've got this error

```
Python version: 3.8.11
Airflow version: 2.2.0b1
Node: e70bca1d41d3
-------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/airflow/.local/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/airflow/.local/lib/python3.8/site-packages/airflow/www/auth.py", line 51, in decorated
    return func(*args, **kwargs)
  File "/home/airflow/.local/lib/python3.8/site-packages/airflow/www/decorators.py", line 72, in wrapper
    return f(*args, **kwargs)
  File "/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/session.py", line 70, in wrapper
    return func(*args, session=session, **kwargs)
  File "/home/airflow/.local/lib/python3.8/site-packages/airflow/www/views.py", line 1368, in task
    session.query(TaskInstance)
  File "/home/airflow/.local/lib/python3.8/site-packages/sqlalchemy/orm/query.py", line 3500, in one
    raise orm_exc.NoResultFound("No row was found for one()")
sqlalchemy.orm.exc.NoResultFound: No row was found for one()
```

### What you expected to happen

On previous version (Apache Airflow 2.1.2) it show information even if DAG never started.
If it's new behavior of Airflow for Task Instances in UI it would be nice get information specific to this error rather than generic error

### How to reproduce

1. Use Apache Airflow: 2.2.0b1
2. Create new DAG
3. In web server try to access to Task Instance Details (`/task` entrypoint) or Rendered Template (`rendered-templates` entrypoint)

### Anything else

As soon as DAG started at least once this kind of errors gone when access Task Instance Details or Rendered Template for this DAG Tasks

Seems like this kind of errors happen after #17719

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/www/views.py
"""
        An endpoint helping check the health status of the Airflow instance,
        including metadatabase and scheduler.
        """
        payload = {'metadatabase': {'status': 'unhealthy'}}
        latest_scheduler_heartbeat = None
        scheduler_status = 'unhealthy'
        payload['metadatabase'] = {'status': 'healthy'}
        try:
            scheduler_job = SchedulerJob.most_recent_job()
            if scheduler_job:
                latest_scheduler_heartbeat = scheduler_job.latest_heartbeat.isoformat()
                if scheduler_job.is_alive():
                    scheduler_status = 'healthy'
        except Exception:
            payload['metadatabase']['status'] = 'unhealthy'
        payload['scheduler'] = {
            'status': scheduler_status,
            'latest_scheduler_heartbeat': latest_scheduler_heartbeat,
        }
        return wwwutils.json_response(payload)
    @expose('/home')
    @auth.has_access(
        [
            (permissions.ACTION_CAN_READ, permissions.RESOURCE_WEBSITE),
        ]
    )
    def index(self):