Fix device naming

Author: andrew-codechimp

custom_components/battery_notes/coordinator.py

@@ -296,9 +296,9 @@ def _link_to_source(self) -> bool:  # noqa: PLR0912
                 device_entry = device_registry.async_get(self.device_id)
             if device_entry:
                 self.device_name = (
-                    (self.subentry.title if self.subentry else None)
-                    or device_entry.name_by_user
-                    or device_entry.name
+                    self.subentry.title
+                    if self.subentry
+                    else device_entry.name_by_user or device_entry.name or ""
                 )
             else:
                 self.device_name = self.subentry.title