put the original suspend handler back, even if it was nil. fixes 2102

git-svn-id: file:///home/svn/framework3/trunk@9547 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/ui/interactive.rb

@@ -218,13 +218,14 @@ protected
 	# notifications.
 	#
 	def restore_suspend
-		if (orig_suspend)
 		begin
+			if (orig_suspend)
 				Signal.trap("TSTP", orig_suspend)
-			rescue
+			else
+				Signal.trap("TSTP", "DEFAULT")
 			end
-
 			self.orig_suspend = nil
+		rescue
 		end
 	end