Hi
Looks like the CheckWifiWizardPlugin fails when the plugin is not present with "ReferenceError: WifiWizard2 is not defined"
$parameters.IsAvailable = !!WifiWizard2;
Seeing for example the implementation of other plugins in the forge the main difference is to not trying to access to a variable just by itself but always use the object where it is registed in, even if it's the window or the navigator.
For example in the Camera plugin:
$parameters.IsAvailable = !!window.cordova && !!navigator.camera;
Regards,
João Rosado