Show message when clutter/gtkclutter bindings are not installed

[amankhoza]

Running fresh install of Ubuntu 18.04 GNOME 3.28 I get the following error:

Error: Requiring GtkClutter, version none: Typelib file for namespace 'GtkClutter' (any version) not found

Stack trace:
  @/home/aman/.local/share/gnome-shell/extensions/[email protected]/prefs.js:43:7
  _getExtensionPrefsModule@resource:///org/gnome/shell/extensionPrefs/main.js:75:13
  wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
  _selectExtension@resource:///org/gnome/shell/extensionPrefs/main.js:90:31
  wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
  _onCommandLine@resource:///org/gnome/shell/extensionPrefs/main.js:243:17
  wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
  main@resource:///org/gnome/shell/extensionPrefs/main.js:397:5
  @<main>:1:43

As mentioned in #2 sudo apt-get install gir1.2-gtkclutter-1.0 fixes the issue but there should probably be some better error handling / message.