Ray: [Dashboard] Blank screens when clicking on expand buttons

[TanjaBayer]

What is the problem?

Setup

• ray 1.1.0.dev0
• python 3.7
• multinode-setup (2 nodes) in docker on mesos dcos (but I can also reproduce it in single node setup)
• Browser: chromium browser Version 86.0.4240.75 on ubuntu 18.04

After starting a node screen turns blank and console error appears:

Reproduction (REQUIRED)

I did some tests and was able to reproduce it like this:

run python docker: docker run --net host -it python:3.7 bash

pip install -U ray
ray install-nightly
ray start --head
python

In the python terminal

import ray
ray.init()
@ray.remote
def test():
    import time
    time.sleep(10)
    print('finished')
test.remote()

Running the test.remote() results in the blank screen

Related on slack:
https://ray-distributed.slack.com/archives/CP950VC76/p1603863841085400

[mfitton]

@TanjaBayer Thanks for reporting this. @ijrsvt hit the same issue. I'm working on a fix for this now.

[mfitton]

@rkooo567 I just made a PR to fix this: https://github.com/ray-project/ray/pull/11954 could you please take a look when you have a chance? I'll check back to make sure tests pass CI in an hour or so.