Handle when installed app has already been removed (#21595)

homeassistant/components/smartthings/__init__.py

@@ -48,10 +48,20 @@ async def async_migrate_entry(hass: HomeAssistantType, entry: ConfigEntry):
     """
     from pysmartthings import SmartThings
 
-    # Delete the installed app
+    # Remove the installed_app, which if already removed raises a 403 error.
     api = SmartThings(async_get_clientsession(hass),
                       entry.data[CONF_ACCESS_TOKEN])
-    await api.delete_installed_app(entry.data[CONF_INSTALLED_APP_ID])
+    installed_app_id = entry.data[CONF_INSTALLED_APP_ID]
+    try:
+        await api.delete_installed_app(installed_app_id)
+    except ClientResponseError as ex:
+        if ex.status == 403:
+            _LOGGER.exception("Installed app %s has already been removed",
+                              installed_app_id)
+        else:
+            raise
+    _LOGGER.debug("Removed installed app %s", installed_app_id)
+
     # Delete the entry
     hass.async_create_task(
         hass.config_entries.async_remove(entry.entry_id))