nodebb crash when read chat message

[Rex Huang]

nodebb crash when read chat message, error log as below:
20/5 02:48 [246] - error: TypeError: Cannot read property 'fromuid' of undefined
at /opt/nodebb/src/messaging.js:146:34
at /opt/nodebb/node_modules/async/lib/async.js:249:17
at /opt/nodebb/node_modules/async/lib/async.js:125:13

[Rex Huang]

this error due to the dirty data in database,
I am using mongodb, but not clear how to clean up the chat message

[Rex Huang]

code changes to avoid the crash, but peoples with dirty data can not see chat message from each other.

			function(messages, next) {
				async.map(messages, function(message, next) {
			if(typeof message === 'undefined') {                               //changes
				winston.error('message is undefined.');
			}else {
				winston.info('message=`' + JSON.stringify(message) );

					var self = parseInt(message.fromuid, 10) === parseInt(fromuid, 10);
					message.fromUser = self ? userData[0] : userData[1];
					message.toUser = self ? userData[1] : userData[0];
					message.timestampISO = utils.toISOString(message.timestamp);
					message.self = self ? 1 : 0;
					message.newSet = false;

					Messaging.parse(message.content, message.fromuid, fromuid, userData[1], userData[0], isNew, function(result) {
						message.content = result;
						next(null, message);
					});
			}

[Rex Huang]

problem solved with the latest fix, thanks~