### 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
```

if not os.path.exists(path):
        return False
    
    if allow_empty:
        return True
    
    if os.path.getsize(path) == 0:
        return False
    
    return True
class DistributionFiles:
    '''has-a various distro file parsers (os-release, etc) and logic for finding the right one.'''
    
    
    
    
    
    OSDIST_LIST = (
        {'path': '/etc/altlinux-release', 'name': 'Altlinux'},
        {'path': '/etc/oracle-release', 'name': 'OracleLinux'},
        {'path': '/etc/slackware-version', 'name': 'Slackware'},
        {'path': '/etc/centos-release', 'name': 'CentOS'},
        {'path': '/etc/redhat-release', 'name': 'RedHat'},
        {'path': '/etc/vmware-release', 'name': 'VMwareESX', 'allowempty': True},
        {'path': '/etc/openwrt_release', 'name': 'OpenWrt'},
        {'path': '/etc/os-release', 'name': 'Amazon'},