UI clocking on runtime exceptions

[onobc]

Uncaught runtime exceptions are causing the UI to "clock" (aka spinning wheel and nothing can be done in the screen aka hang).

Reproduce w/ the following steps:

1. Modify a controller in SCDF to throw runtime exception
2. Navigate to UI screen that calls that controller

Example:

1. Insert this code into StreamDefinitionController.list

if (1 == 1) {
   throw new RuntimeException("BOOM!");
}

2. Navigate to http://localhost:9393/dashboard/index.html#/streams/list
   And Voila...

Background info in Slack thread: https://vmware.slack.com/archives/C49UPQAP8/p1648783622245069?thread_ts=1648783305.232759&cid=C49UPQAP8