Fix os_family and distribution on archlinux

Fixes #8732, ansible/ansible-modules-core#34

lib/ansible/module_utils/facts.py

@@ -273,7 +273,8 @@ class Facts(object):
             self.facts['distribution_release'] = dist[2] or 'NA'
             # Try to handle the exceptions now ...
             for (path, name) in Facts.OSDIST_LIST:
-                if os.path.exists(path) and os.path.getsize(path) > 0:
+                if os.path.exists(path):
+                    if os.path.getsize(path) > 0:
                         if self.facts['distribution'] in ('Fedora', ):
                             # Once we determine the value is one of these distros
                             # we trust the values are always correct