Endless loading when opening a file in section "Shared with me" or "Shared with other"

[ScharfViktor]

Steps to reproduce

1. user 1 share file with type "jpeg" to user 2
2. user 2 accepted file and
3. user try to open file in section "shared with me"

Expected behaviour

File can be opened in Mediaviewer.

Actual behaviour

endless loading. "Cannot read property 'substr' of undefined".

Client configuration

**Browser: Chrome v. 91.0.4472.106 **

Operating system: Macos Big Sure v.11.2.3

Server configuration

ocis v1.7.0 reachable at https://localhost:9200

### Browser log
TypeError: Cannot read property 'substr' of undefined
    at s.thumbUrl (web-app-media-viewer-31ff9edb.js:1)
    at Xf.get (vendor-ec2977a5.js:28)
    at Xf.evaluate (vendor-ec2977a5.js:28)
    at s.thumbUrl (vendor-ec2977a5.js:28)
    at s.loadMedium (web-app-media-viewer-31ff9edb.js:1)
    at s.activeIndex (web-app-media-viewer-31ff9edb.js:1)
    at Xf.run (vendor-ec2977a5.js:28)
    at Gf (vendor-ec2977a5.js:28)
    at Array.<anonymous> (vendor-ec2977a5.js:28)
    at Cd (vendor-ec2977a5.js:28)

[kulmann]

@ScharfViktor could you add the server (oCIS or ownCloud 10? which version?) and the used web version if run standalone?

From your screenshot I can already guess that it's an oCIS, probably with the embedded version of web. But please write it down here in the ticket, just to be sure. :-)

[wkloucek]

@kulmann I reproduced this with oCIS 1.9.0-RC1 / Web 3.4.1

Peek.2021-07-13.13-37.mp4

Gives me a TypeError in the console:

vendor-a9f0cd43.js:38 TypeError: Cannot read property 'substr' of undefined
    at a.thumbUrl (web-app-media-viewer-3ee62360.js:1)
    at Em.get (vendor-a9f0cd43.js:38)
    at Em.evaluate (vendor-a9f0cd43.js:38)
    at a.thumbUrl (vendor-a9f0cd43.js:38)
    at a.loadMedium (web-app-media-viewer-3ee62360.js:1)
    at activeIndex (web-app-media-viewer-3ee62360.js:1)
    at Jd (vendor-a9f0cd43.js:38)
    at Em.run (vendor-a9f0cd43.js:38)
    at _m (vendor-a9f0cd43.js:38)
    at Array.<anonymous> (vendor-a9f0cd43.js:38)

[pascalwengerter]

Fails initially on https://ocis.ocis-web.latest.owncloud.works with this.activeMediaFile.etag is undefined but mediaViewer works fine on page reload..

[dschmidt]

Fixed in #6456