Black Screen on Login

[David Edmundson]

​I have a new theory as to what might be wrong.

With KScreen's backend being out of process it could be signalling that
there's a new screen before plasmashell has processed the X events and be
trying to look for the relevant QScreen object before plasmashell has made
it.

Could someone put in some debug on shellcorona.cpp:851 before it returns a
nullptr in ShellCorona::outputToScreen and see if that gets triggered.

You may need to use printf() as plasmashell has this somewhat odd --shutup
mode that suppresses all qDebug in an effort to make fixing this as
difficult as possible.
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