propagate error for taxonomy handler.

modules/taxonomy/cms_taxonomy_api.e

@@ -152,6 +152,7 @@ feature -- Access node
 			a_term_exists: a_term.has_id
 		do
 			Result := taxonomy_storage.entities_associated_with_term (a_term)
+			error_handler.append (taxonomy_storage.error_handler)
 		end
 
 feature -- Write

modules/taxonomy/handler/taxonomy_handler.e

@@ -137,6 +137,9 @@ feature -- HTTP Methods
 							s.append ("</ul>%N")
 						end
 					else
+						if taxonomy_api.error_handler.has_error then
+							l_page.add_error_message ({STRING_32} "Query error: " + taxonomy_api.error_handler.as_string_representation)
+						end
 						s.append ("No entity found.")
 					end
 					l_page.set_main_content (s)