added postcondition

jj_vision/interface/views/view.e

@@ -59,6 +59,8 @@ feature {NONE} -- Initialization
 			default_create
 			set_target (a_target)	-- calls `draw'
 --			draw
+		ensure
+			target_imp /= Void
 		end
 
 	create_interface_objects
@@ -252,6 +254,7 @@ feature -- Element change
 			draw
 		ensure
 			has_target: has_target (a_target)
+			target_imp /= Void
 		end
 
 	set_parent_view (a_view: VIEW)