### 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
```

sunos_facts['distribution'] = data.split()[0]
            sunos_facts['distribution_version'] = data.split()[1]
            sunos_facts['distribution_release'] = ora_prefix + data
            sunos_facts['distribution_major_version'] = uname_r.split('.')[1].rstrip()
            return sunos_facts
        uname_v = get_uname(self.module, flags=['-v'])
        distribution_version = None
        if 'SmartOS' in data:
            sunos_facts['distribution'] = 'SmartOS'
            if _file_exists('/etc/product'):
                product_data = dict([l.split(': ', 1) for l in get_file_content('/etc/product').splitlines() if ': ' in l])
                if 'Image' in product_data:
                    distribution_version = product_data.get('Image').split()[-1]
        elif 'OpenIndiana' in data:
            sunos_facts['distribution'] = 'OpenIndiana'
        elif 'OmniOS' in data:
            sunos_facts['distribution'] = 'OmniOS'
            distribution_version = data.split()[-1]
        elif uname_v is not None and 'NexentaOS_' in uname_v:
            sunos_facts['distribution'] = 'Nexenta'
            distribution_version = data.split()[-1].lstrip('v')
        if sunos_facts.get('distribution', '') in ('SmartOS', 'OpenIndiana', 'OmniOS', 'Nexenta'):
            sunos_facts['distribution_release'] = data.strip()
            if distribution_version is not None:
                sunos_facts['distribution_version'] = distribution_version
            elif uname_v is not None:
                sunos_facts['distribution_version'] = uname_v.splitlines()[0].strip()
            return sunos_facts
        return sunos_facts
class DistributionFactCollector(BaseFactCollector):