cannot show / add / remove members from spaces

[wusamba]

Members-pane in webui does not open completely

Steps to reproduce the behavior:

1. create new Space and add Manager to this Space
2. add another existing Member as Editor (or create new one first) to Space
3. delete last added Member in Usermanagement (not in Space)

Expected behavior

Actual behavior

Setup

docker -> owncloud/ocis:latest

Additional context

Removing the Spacemember first is functioning as expected.

[pascalwengerter]

Potentially a https://github.com/owncloud/web/ issue @kulmann