When a component is disposed of, without calling ReactDOM.unmountComponentAtNode() on the data-reactroot in the destroyed component, the React.Component and videojs.Component (here EpisodeList and vjsEpisodeList) remain in memory.
The videojs.Component should listen for its dispose event and unmount its React root in the corresponding React.Component.
Using the default example, when disposing the player, a React DOMException was thrown because Video.js removed an element managed by React.
A simple solution is to wrap the player div in a separate div.
Fixes#4935.
