[conf] Fix traceback in reading uknown keys from /etc/dnf/modules.d/

Author: Daniel Mach

dnf/conf/read.py

@@ -136,7 +136,7 @@ def _build_module(self, parser, id_, module_path):
                 if not value or value == 'None':
                     value = None
 
-                opt = module.__getattribute__(name)
+                opt = getattr(module, name, None)
                 if opt:  # and not opt._is_runtimeonly():
                     try:
                         if value is not None: