There's an easy workaround.
edit /etc/kde4/kdm/kdmrc
and note the final line below.
Code:
[X-*-Core]
AllowNullPasswd=false
AllowRootLogin=false
AllowShutdown=Root
AutoReLogin=false
ClientLogFile=.xsession-errors-%d
Reset=/etc/kde4/kdm/Xreset
Session=/etc/kde4/kdm/Xsession
Setup=/etc/kde4/kdm/Xsetup
Startup=/etc/kde4/kdm/Xstartup
TerminateServer=true
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