Kill tasks when their websocket closes. Sigh.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3779 ed5197a5-7fde-0310-b194-c3ffbd925b24

core/httpd.js

@@ -301,10 +301,14 @@ function handleWebSocketRequest(request, response, client) {
 					break;
 				}
 			}
+		} else {
+			response.onClose();
+			client.close();
 		}
 	});
 	client.onError(function(error) {
 		logError(client.peerName + " - - [" + new Date() + "] " + error);
+		response.onError(error);
 	});
 
 	let headers = {