Fix empty components (#23177)

Author: balloob

homeassistant/loader.py

@@ -51,11 +51,11 @@
 _UNDEF = object()
 
 
-def manifest_from_legacy_module(module: ModuleType) -> Dict:
+def manifest_from_legacy_module(domain: str, module: ModuleType) -> Dict:
     """Generate a manifest from a legacy module."""
     return {
-        'domain': module.DOMAIN,  # type: ignore
-        'name': module.DOMAIN,  # type: ignore
+        'domain': domain,
+        'name': domain,
         'documentation': None,
         'requirements': getattr(module, 'REQUIREMENTS', []),
         'dependencies': getattr(module, 'DEPENDENCIES', []),
@@ -106,7 +106,7 @@ def resolve_legacy(cls, hass: 'HomeAssistant', domain: str) \
 
         return cls(
             hass, comp.__name__, pathlib.Path(comp.__file__).parent,
-            manifest_from_legacy_module(comp)
+            manifest_from_legacy_module(domain, comp)
         )
 
     def __init__(self, hass: 'HomeAssistant', pkg_path: str,

tests/common.py

@@ -487,7 +487,7 @@ def __init__(self, domain=None, dependencies=None, setup=None,
     def mock_manifest(self):
         """Generate a mock manifest to represent this module."""
         return {
-            **loader.manifest_from_legacy_module(self),
+            **loader.manifest_from_legacy_module(self.DOMAIN, self),
             **(self._partial_manifest or {})
         }