Fix application issue on reload when served by backend #2238
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When the backend is serving the UI - e.g. in the case of cf push, reloading was broken in the app - with Angular it uses "proper" URLs rather than the # - so the backend does not know about these routes and returns a 404 - to reproduce, cf push Stratos, navigate to part of the UI and hit the browser refresh button.
This PR fixes this - when the backend is serving the UI, it now adds an error handler and if the error is 404 and the request was not a backend API request, the application's index.html will be returned, allowing it to route correctly.