Redirect to skapp container not working as desired

[mike76-dev]

If the skapp url is given in the form https://siasky.net/skylink (e.g. as produced by siasky.net web interface), then skyid.sessionStart() changes window.location.href and the web page is reloaded. After that, skyid.sessionStart() execution stops and no code is executed after that.
However, there is a short delay before the page is reloaded. Within that time, it is possible to see an error message in the console saying: "TypeError: Cannot read property 'focus' of null". Most probably, this is thrown in popupCenter() where newWindow object is undefined. (This is just an observation, which is probably not 100% related to the issue).
When the page reloads, no message is broadcast, and the app has no chance to know what has happened, so the login just fails for no obvious reason.
The second time, from the redirected url, everything works.