Add missing platforms_exist guard to check_config (#114600)

* Add missing platforms_exist guard to check_config

related issue #112811

When the exception hits, the config will end up being saved in the traceback
so the memory is never released.

This matches the check_config code to homeassistant.config to avoid having
the exception thrown.

* patch

* merge branch

homeassistant/helpers/check_config.py

@@ -198,15 +198,16 @@ async def _get_integration(
 
         # Check if the integration has a custom config validator
         config_validator = None
-        try:
-            config_validator = await integration.async_get_platform("config")
-        except ImportError as err:
-            # Filter out import error of the config platform.
-            # If the config platform contains bad imports, make sure
-            # that still fails.
-            if err.name != f"{integration.pkg_path}.config":
-                result.add_error(f"Error importing config platform {domain}: {err}")
-                continue
+        if integration.platforms_exists(("config",)):
+            try:
+                config_validator = await integration.async_get_platform("config")
+            except ImportError as err:
+                # Filter out import error of the config platform.
+                # If the config platform contains bad imports, make sure
+                # that still fails.
+                if err.name != f"{integration.pkg_path}.config":
+                    result.add_error(f"Error importing config platform {domain}: {err}")
+                    continue
 
         if config_validator is not None and hasattr(
             config_validator, "async_validate_config"

tests/helpers/test_check_config.py

@@ -350,6 +350,7 @@ async def test_config_platform_import_error(hass: HomeAssistant) -> None:
             side_effect=ImportError("blablabla"),
         ),
         patch("os.path.isfile", return_value=True),
+        patch("homeassistant.loader.Integration.platforms_exists", return_value=True),
         patch_yaml_files(files),
     ):
         res = await async_check_ha_config_file(hass)
@@ -373,6 +374,7 @@ async def test_platform_import_error(hass: HomeAssistant) -> None:
             "homeassistant.loader.Integration.async_get_platform",
             side_effect=[None, ImportError("blablabla")],
         ),
+        patch("homeassistant.loader.Integration.platforms_exists", return_value=True),
         patch("os.path.isfile", return_value=True),
         patch_yaml_files(files),
     ):