Fix empty files included by !include_dir_named (#108489)

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

homeassistant/util/yaml/loader.py

@@ -359,7 +359,12 @@ def _include_dir_named_yaml(loader: LoaderType, node: yaml.nodes.Node) -> NodeDi
         filename = os.path.splitext(os.path.basename(fname))[0]
         if os.path.basename(fname) == SECRET_YAML:
             continue
-        mapping[filename] = load_yaml(fname, loader.secrets)
+        loaded_yaml = load_yaml(fname, loader.secrets)
+        if loaded_yaml is None:
+            # Special case, an empty file included by !include_dir_named is treated
+            # as an empty dictionary
+            loaded_yaml = NodeDictClass()
+        mapping[filename] = loaded_yaml
     return _add_reference(mapping, loader, node)
 
 

tests/util/yaml/test_init.py

@@ -193,7 +193,7 @@ def test_include_dir_list_recursive(
         ),
         (
             {"/test/first.yaml": "1", "/test/second.yaml": None},
-            {"first": 1, "second": None},
+            {"first": 1, "second": {}},
         ),
     ],
 )