* src/nautilus-application.c: (nautilus_application_startup):
	Do the required directory check only if the nautilus shell is not
	about to be killed.  As a side effect of the new desktop location
	preference, the required directory code now checks preferences.
	Unfortunately, at this stage in the game, nautilus preferences
	might not be initialized, causing assertions.  This only occurs in
	the "nautilus --quit" case.