fix: main_namespace is not mandatory (for example for risotto)

src/rougail/convert/collect.py

@@ -37,6 +37,7 @@ from .object_model import (
 )
 from ..i18n import _
 from ..error import DictConsistencyError
+from ..tiramisu import CONVERT_OPTION
 
 
 class CollectFamily:
@@ -197,7 +198,14 @@ class CollectVariable:
             )
         new_params = []
         namespace = self.objectspace.namespace
+        params_data = list(CONVERT_OPTION.get(self.user_type, {}).get("params", {}))
         for key, val in params.items():
+            if params_data and key not in params_data:
+                raise DictConsistencyError(
+                    _('params "{0}" is not a known parameters with type "{1}" for "{2}" (the list of possible parameters is {3})').format(key, self.user_type, self.path, display_list(params_data, add_quote=True)),
+                    92,
+                    self.sources,
+                )
             try:
                 new_params.append(
                     AnyParam(

src/rougail/structural_directory/__init__.py

@@ -64,15 +64,18 @@ class Walker:
         main_structures: Optional[List[str]] = None,
         isolated_namespace: bool = True,
     ) -> None:
-        directory_dict = chain(
+        if not main_namespace:
-            (
+            directory_dict = extra_structures.items()
+        else:
+            directory_dict = chain(
                 (
-                    main_namespace,
+                    (
-                    main_structures,
+                        main_namespace,
+                        main_structures,
+                    ),
                 ),
-            ),
+                extra_structures.items(),
-            extra_structures.items(),
+            )
-        )
         for namespace, directories in directory_dict:
             self.convert.create_namespace(namespace, isolated_namespace)
             for filename in self.get_sorted_filenames(directories):