Tor Browser bootstrap process got stuck after interrupting it

I am still trying to figure out good steps to reproduce that bug but if you click on the gear icon and configure bridges then during bootstrap click again and change them or get back to start without bridges then you end up with a broken bootstrap process saying:

SUCCESS connected to Tor control port.
Cookie Auth file not created
Unable to start Tor: java.io.Exception: Cookie Auth file not created: /data/user/0/org.torproject.torbrowser_alpha/app_torservice/lib/tor/control_auth_cookie, len = 0

There is usually no way to recover from that and one has to start over again by kiling the app.

That's with the TOPL changes landed.

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