Picture with Whitesapce as Name Doesn't Load

Description:

I tend to paste images into RocketChat, which implicitly creates a pre-generated name. As I tend to avoid too long names, I shift + tab to get to the name field, replace it with a whitespace and hit enter

Steps to reproduce:

1. Paste a picture into RC
2. Replace the picture name with a whitespace
3. Upload the Image
4. Click on the picture preview

Expected behavior:

A click on the preview opens the picture.

Actual behavior:

When clicking on the picture, the load screen overlay pops up and it hangs there.

Server Setup Information:

• Version of Rocket.Chat Server: 6.6
• Operating System: n/a
• Deployment Method: n/a
• Number of Running Instances: n/a
• DB Replicaset Oplog: n/a
• NodeJS Version: n/a
• MongoDB Version: n/a

Client Setup Information

• Desktop App or Browser Version: Browser
• Operating System: Linux

Additional context

This affects other OSes and the desktop app as well.

Relevant logs:

n/a

Reproduce the issue by pasting an image, replacing its generated name with a whitespace, uploading it, and opening the preview. Trace the browser-side upload and image-preview flow to identify why the preview remains on its loading overlay; done means whitespace-named images open normally in the browser and desktop app.