fix(VgFullscreenAPI): Fix null reference error when browser doesn't support fullscreen api
fix(VgFullscreenAPI): Fix null reference error when browser doesn't support fullscreen api

this.available is used to show/hide the fullscreen control, but when this.polyfill is null it still
attempts to bind a listener and a switch case attempts to use this.polyfill.onchange.  This fix
moves the this.available binding above these statements and returns out of the init if fullscreen is
unavailable

kwarismian/videogular2,videogular/videogular2,kwarismian/videogular2,kwarismian/videogular2,amitkumarmahajan/videogular2,videogular/videogular2,amitkumarmahajan/videogular2,amitkumarmahajan/videogular2,videogular/videogular2