- tst_MLW_grammar.py: XML-switch repaired

DHParser/configuration.py

@@ -106,6 +106,7 @@ def finalize_presets():
     import multiprocessing
     import os
     import pickle
+    global CONFIG_PRESET
     if multiprocessing.get_start_method() != 'fork':
         syncfile_path = get_syncfile_path(os.getpid())
         existing_syncfile = CONFIG_PRESET['syncfile_path']

DHParser/syntaxtree.py

@@ -873,6 +873,7 @@ class Node:  # (collections.abc.Sized): Base class omitted for cython-compatibil
         """
         switch = how.lower()
 
+        from DHParser import configuration
         if switch == 'ast':
             switch = get_config_value('ast_serialization').lower()
         elif switch == 'cst':