check post exists before delete restore

src/posts/tools.js

@@ -19,6 +19,12 @@ module.exports = function(Posts) {
 	function togglePostDelete(uid, pid, isDelete, callback) {
 		async.waterfall([
 			function (next) {
+				Posts.exists(pid, next);
+			},
+			function (exists, next) {
+				if (!exists) {
+					return next(new Error('[[error:no-post]]'));
+				}
 				Posts.getPostField(pid, 'deleted', next);
 			},
 			function (deleted, next) {