2008-10-22  Sven Neumann  <sven@gimp.org>

	Bug 555246 – gimp crashes when a file is opened while a preview 
is
	generating

	* app/widgets/gimpthumbbox.c: set box->progress to NULL in
	destroy() and check for progress being NULL in various places so
	we don't crash on API calls after the widget is destroyed.


svn path=/trunk/; revision=27360