Merge pull request #15208 from bcoca/constants_pathlist

centralize path list handling

lib/ansible/plugins/action/template.py

@@ -123,7 +123,8 @@ class ActionModule(ActionBase):
             # loader, so that it knows about the other paths to find template files
             searchpath = [self._loader._basedir, os.path.dirname(source)]
             if self._task._role is not None:
-                searchpath.insert(1, C.DEFAULT_ROLES_PATH)
+                if C.DEFAULT_ROLES_PATH:
+                    searchpath[:0] = C.DEFAULT_ROLES_PATH
                 searchpath.insert(1, self._task._role._role_path)
 
             self._templar.environment.loader.searchpath = searchpath