Only parse /etc/os-release if it isn't empty

The fields in /etc/os-release are all optional and some systems provide an empty file.

This follows how Ansible handles this: https://github.com/ansible/ansible/pull/7887

LbPlatformUtils/inspect.py

@@ -121,8 +121,10 @@ def _Linux_os():
     version = ''
 
     try:
-        if os.path.exists('/etc/os-release'):
-            name, version = parse_os_release(open('/etc/os-release'))
+        os_release_fn = '/etc/os-release'
+        # Some systems have an empty /etc/os-release that we should ignore
+        if os.path.exists(os_release_fn) and os.path.getsize(os_release_fn) > 0:
+            name, version = parse_os_release(open(os_release_fn))
 
         elif os.path.exists('/etc/redhat-release'):
             name, version = parse_system_release(