QmlProfiler: Fix potential null pointer access.

Change-Id: Ic1f52a73c910612d0664e0ea909f04729109bcb2
Reviewed-by: Ulf Hermann <ulf.hermann@theqtcompany.com>
Botan: Fix potential null pointer access.

Change-Id: I0bc9ea383f74dc642b17001593313044a36abede
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>
Debugger: Reset "Load system GDB pretty printer" option again

Forcing a reset was already done with cc4943a2 but that change
failed to change the default value.

Change-Id: I6bb61d0f5b303f021910a3ae523de2e523b7ca0c
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>