fix flagging and post filter

cant flag posts that don't exist anymore

src/posts.js

@@ -113,7 +113,9 @@ var async = require('async'),
 
 			data.pid = pid;
 
-			plugins.fireHook('filter:post.getFields', {posts: [data], fields: fields}, callback);
+			plugins.fireHook('filter:post.getFields', {posts: [data], fields: fields}, function(err, data) {
+				callback(err, (data && Array.isArray(data.posts) && data.posts.length) ? data.posts[0] : null);
+			});
 		});
 	};
 
@@ -130,7 +132,9 @@ var async = require('async'),
 			if (err) {
 				return callback(err);
 			}
-			plugins.fireHook('filter:post.getFields', {posts: posts, fields: fields}, callback);
+			plugins.fireHook('filter:post.getFields', {posts: posts, fields: fields}, function(err, data) {
+				 callback(err, (data && Array.isArray(data.posts)) ? data.posts : null);
+			});
 		});
 	};
 

src/posts/flags.js

@@ -8,15 +8,21 @@ var async = require('async'),
 
 module.exports = function(Posts) {
 	Posts.flag = function(pid, callback) {
-		async.parallel([
-			function(next) {
-				db.sortedSetAdd('posts:flagged', Date.now(), pid, next);
-			},
-			function(next) {
-				db.incrObjectField('post:' + pid, 'flags', next);
+		Posts.exists(pid, function(err, exists) {
+			if (err || !exists) {
+				return callback(err || new Error('[[error:no-post]]'));
 			}
-		], function(err, results) {
-			callback(err);
+
+			async.parallel([
+				function(next) {
+					db.sortedSetAdd('posts:flagged', Date.now(), pid, next);
+				},
+				function(next) {
+					db.incrObjectField('post:' + pid, 'flags', next);
+				}
+			], function(err, results) {
+				callback(err);
+			});
 		});
 	};
 

src/socket.io/posts.js

@@ -303,6 +303,9 @@ SocketPosts.flag = function(socket, pid, callback) {
 		post;
 
 	async.waterfall([
+		function(next) {
+			posts.flag(pid, next);
+		},
 		function(next) {
 			user.getUserFields(socket.uid, ['username', 'reputation'], next);
 		},
@@ -323,7 +326,7 @@ SocketPosts.flag = function(socket, pid, callback) {
 		},
 		function(topicTitle, next) {
 			message = '[[notifications:user_flagged_post_in, ' + userName + ', ' + topicTitle + ']]';
-			postTools.parse(post, socket.uid, next);
+			postTools.parsePost(post, socket.uid, next);
 		},
 		function(post, next) {
 			groups.get('administrators', {}, next);
@@ -342,9 +345,6 @@ SocketPosts.flag = function(socket, pid, callback) {
 				notifications.push(notification, adminGroup.members, next);
 			});
 		},
-		function(next) {
-			posts.flag(pid, next);
-		},
 		function(next) {
 			if (!parseInt(post.uid, 10)) {
 				return next();