Fix MusicCast select current_option (home-assistant#63668)

Co-authored-by: Franck Nijhof <[email protected]>

Author: micha91

homeassistant/components/yamaha_musiccast/select.py

@@ -59,4 +59,4 @@ def options(self):
     @property
     def current_option(self):
         """Return the currently selected option."""
-        return self.capability.options[self.capability.current]
+        return self.capability.options.get(self.capability.current)