[Bug] Download user data builds corrupted zip file

[piotrkochan]

Description:

Download user data functionality does not work, it generates and sends .zip which is corrupted.

Steps to reproduce:

1. Generate user data in user preferences
2. Receive e-mail
3. Download
4. Zip can't be opened, extracted (also seems too small)
5. Extra: in client - click generate again, there is popup with 'click here to download file' and it does not work until right click - open in new window.

Expected behavior:

Full, working history on email.

Actual behavior:

Described in Description above.

Server Setup Information:

• Version of Rocket.Chat Server: 3.6.3
• Operating System: Ubuntu 16
• Deployment Method: tar
• Number of Running Instances: 1
• DB Replicaset Oplog: yes
• NodeJS Version: 12
• MongoDB Version: 4

Client Setup Information

• Desktop App or Browser Version: 4
• Operating System: Ubuntu

Additional context

Relevant logs:

A lot of logs like below shows up:

I20201006-11:38:02.965(2) Exception in callback of async function: TypeError: Cannot read property 'description' of undefined     at exportMessageObject (app/user-data-download/server/cronProcessDownloads.js:207:34)     at app/user-data-download/server/cronProcessDownloads.js:245:24     at runWithEnvironment (packages/meteor.js:1286:24)     at packages/meteor.js:1299:14     at Array.forEach (<anonymous>)     at app/user-data-download/server/cronProcessDownloads.js:238:10     at /opt/Rocket.Chat/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40 
I20201006-11:38:02.966(2) Exception in callback of async function: TypeError: Cannot read property 'description' of undefined     at exportMessageObject (app/user-data-download/server/cronProcessDownloads.js:207:34)     at app/user-data-download/server/cronProcessDownloads.js:245:24     at runWithEnvironment (packages/meteor.js:1286:24)     at packages/meteor.js:1299:14     at Array.forEach (<anonymous>)     at app/user-data-download/server/cronProcessDownloads.js:238:10     at /opt/Rocket.Chat/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40 

[piotrkochan]

log output similar to #17714