Pr/11430 (#11587)

* Fix error when name is non-latin script

When the name is non-latin script (e.g. Japanese), slugify returns empty string and causes failure in a later stage. This commit fixes the issue by using default name.

* Add test

tests/helpers/test_entity.py

@@ -31,6 +31,14 @@ def test_generate_entity_id_given_keys():
             'test.another_entity']) == 'test.overwrite_hidden_true'
 
 
+def test_generate_entity_id_with_nonlatin_name():
+    """Test generate_entity_id given a name containing non-latin characters."""
+    fmt = 'test.{}'
+    assert entity.generate_entity_id(
+        fmt, 'ホームアシスタント', current_ids=[]
+    ) == 'test.unnamed_device'
+
+
 def test_async_update_support(hass):
     """Test async update getting called."""
     sync_update = []