Only set distribution_release on CoreOS nodes that autoupdate. Fixes #15228

lib/ansible/module_utils/facts.py

@@ -493,6 +493,7 @@ class Facts(object):
 
                             if self.facts['distribution'].lower() == 'coreos':
                                 data = get_file_content('/etc/coreos/update.conf')
+                                if data:
                                     release = re.search("^GROUP=(.*)", data)
                                     if release:
                                         self.facts['distribution_release'] = release.group(1).strip('"')