Cannot answer to a livechat as a manager if agent has not answered yet

[sampaiodiego]

Description:

A livechat manager would like to respond to a livechat if the designated agent has not answered in time (or for whatever reason), but currently nothing happens.

Server Setup Information:

• Version of Rocket.Chat Server: 0.62
• Operating System: Any
• Deployment Method(snap/docker/tar/etc): Any
• Number of Running Instances: 1
• DB Replicaset Oplog: yes

Steps to Reproduce:

1. As a visitor, start a livechat
2. As a manager go to Livechat > Current livechat and pick up the one created before
3. As a manager try to send a message

Expected behavior:

The message should be sent and the visitor should see it.

Actual behavior:

Nothing happens on either manager and visitor side, and an error appear on server's log.

Relevant logs:

I20180306-10:10:06.642(-3)? Exception while invoking method 'sendMessage' TypeError: Cannot read property 'blocker' of undefined
I20180306-10:10:06.661(-3)?     at MethodInvocation.sendMessage (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/rocketchat_lib.js:15632:62)
I20180306-10:10:06.662(-3)?     at MethodInvocation.methodsMap.(anonymous function) (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/rocketchat_lib.js:2158:28)
I20180306-10:10:06.662(-3)?     at MethodInvocation.methodMap.(anonymous function) (packages/rocketchat_monitoring.js:2731:30)
I20180306-10:10:06.662(-3)?     at maybeAuditArgumentChecks (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:1877:12)
I20180306-10:10:06.662(-3)?     at DDP._CurrentMethodInvocation.withValue (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:902:126)
I20180306-10:10:06.663(-3)?     at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1186:15)
I20180306-10:10:06.663(-3)?     at DDPServer._CurrentWriteFence.withValue (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:902:98)
I20180306-10:10:06.663(-3)?     at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1186:15)
I20180306-10:10:06.663(-3)?     at Promise (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:902:46)
I20180306-10:10:06.663(-3)?     at new Promise (<anonymous>:null:null)
I20180306-10:10:06.663(-3)?     at Session.method (/Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:875:23)
I20180306-10:10:06.663(-3)?     at /Users/diegosampaio/dev/Rocket.Chat/.meteor/local/build/programs/server/packages/ddp-server.js:754:85