Fix nothing node.

Author: WaVEV

django_mongodb_backend/lookups.py

@@ -151,11 +151,11 @@ def register_lookups():
     FieldGetDbPrepValueIterableMixin.resolve_expression_parameter = (
         field_resolve_expression_parameter
     )
-    In.as_mql_path = RelatedIn.as_mql_path = wrap_in(builtin_lookup_path)
     In.as_mql_expr = RelatedIn.as_mql_expr = wrap_in(builtin_lookup_expr)
+    In.as_mql_path = RelatedIn.as_mql_path = wrap_in(builtin_lookup_path)
     In.get_subquery_wrapping_pipeline = get_subquery_wrapping_pipeline
-    IsNull.as_mql_path = is_null_path
     IsNull.as_mql_expr = is_null_expr
+    IsNull.as_mql_path = is_null_path
     Lookup.can_use_path = can_use_path
     PatternLookup.prep_lookup_value_mongo = pattern_lookup_prep_lookup_value
     # Patching the main method, it is not supported yet.

django_mongodb_backend/query.py

@@ -336,12 +336,12 @@ def where_node(self, compiler, connection, as_path=False):
     return mql
 
 
-def nothing_node(self, compiler, connection):
+def nothing_node(self, compiler, connection, as_path=None):  # noqa: ARG001
     return self.as_sql(compiler, connection)
 
 
 def register_nodes():
     ExtraWhere.as_mql = extra_where
     Join.as_mql = join
-    NothingNode.as_mql_expr = nothing_node
+    NothingNode.as_mql = nothing_node
     WhereNode.as_mql = where_node