gnome-shell-extension-sound-output-device-chooser

original gnome shell extension: https://extensions.gnome.org/extension/906/sound-output-device-chooser/ Sound Input & Output Device Chooser by kgshank

There are some minor problems in this extension.

1. when no microphone is connected, "extension initialsing" appears in the menu
2. After removing microphones, the old one still stays in the menu

This modified version corrected these minor issues,