Make sure Core returns a valid config

supervisor/homeassistant/api.py

@@ -175,7 +175,10 @@ class HomeAssistantAPI(CoreSysAttributes):
 
     async def get_config(self) -> dict[str, Any]:
         """Return Home Assistant config."""
-        return await self._get_json("api/config")
+        config = await self._get_json("api/config")
+        if config is None or not isinstance(config, dict):
+            raise HomeAssistantAPIError("No config received from Home Assistant API")
+        return config
 
     async def get_core_state(self) -> dict[str, Any]:
         """Return Home Assistant core state."""

supervisor/homeassistant/core.py

@@ -305,10 +305,6 @@ class HomeAssistantCore(JobGroup):
                 self._error_state = True
                 return
 
-            if data is None:
-                self._error_state = True
-                return
-
             # Verify that the frontend is loaded
             if "frontend" not in data.get("components", []):
                 _LOGGER.error("API responds but frontend is not loaded")