### Summary

Ansible no longer returns distribution facts for my Amazon Linux 2 instances after #73767.

### Issue Type

Bug Report

### Component Name

setup

### Ansible Version

```console (paste below)
$ ansible --version
ansible [core 2.11.0b2.post0]  (detached HEAD 30c465c1a9) last updated 2021/03/17 18:53:46 (GMT -400)
  config file = /home/ec2-user/ansible-aws-coll/ansible/ansible.cfg
  configured module search path = ['/home/ec2-user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/ec2-user/tmp/ansible/lib/ansible
  ansible collection location = /home/ec2-user/ansible-aws-coll/ansible/collections
  executable location = /home/ec2-user/tmp/ansible/bin/ansible
  python version = 3.8.5 (default, Feb 18 2021, 01:24:20) [GCC 7.3.1 20180712 (Red Hat 7.3.1-12)]
  jinja version = 2.11.3
  libyaml = True
```


### Configuration

```console (paste below)
$ ansible-config dump --only-changed
DEVEL_WARNING(env: ANSIBLE_DEVEL_WARNING) = False
```


### OS / Environment

Amazon Linux 2

### Steps to Reproduce

```
ansible localhost -m setup | grep distribution
```


### Expected Results

With 78d3810fdf:
```
[WARNING]: No inventory was parsed, only implicit localhost is available
        "ansible_distribution": "Amazon",
        "ansible_distribution_file_parsed": true,
        "ansible_distribution_file_path": "/etc/system-release",
        "ansible_distribution_file_variety": "Amazon",
        "ansible_distribution_major_version": "2",
        "ansible_distribution_release": "NA",
        "ansible_distribution_version": "2",
```

### Actual Results

```console (paste below)
[WARNING]: No inventory was parsed, only implicit localhost is available
```

else:
                
                dist_file_dict['distribution'] = dist_file_content.split()[0]
            return True, dist_file_dict
        if name in self.OS_RELEASE_ALIAS:
            if self.OS_RELEASE_ALIAS[name] in dist_file_content:
                dist_file_dict['distribution'] = name
                return True, dist_file_dict
            return False, dist_file_dict
        
        
        try:
            
            distfunc_name = 'parse_distribution_file_' + name
            distfunc = getattr(self, distfunc_name)
            parsed, dist_file_dict = distfunc(name, dist_file_content, path, collected_facts)
            return parsed, dist_file_dict
        except AttributeError as exc:
            self.module.debug('exc: %s' % exc)
            
            return False, dist_file_dict
        return True, dist_file_dict
        
        
        
        
        
        
        
    def _guess_distribution(self):