STYLE: Move exception logging to die()

Change die() in SlicerWizard/Utilities.py to log the current exception,
if there is one, and --debug has been given. This allows us to remove
the code to re-raise the exception (in order to produce the traceback)
any time we would otherwise call die() after catching an exception.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22966 3bd1e089-480b-0410-8dfb-8563597acbee