Initial Connection to the UI; Error no artifacts could be loaded

[jlewi]

/kind bug

What steps did you take and what happened:
[A clear and concise description of what the bug is.]
When I first connect to the metadata store UI I typically see an error along the lines of "No artifacts could be loaded". (I will try to capture the exact text the next time I see the error and look for JS errors).

The error appears to go away after clicking refresh.

Using v0.6.2.

Might be related to #114 (connection errors)

/cc @zhenghuiwang @ajayalfred