[YUNIKORN-2935] Only show children when the queueNode actually has children #212
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What is this PR for?
Only show children when the queueNode actually has children
What type of PR is it?
What is the Jira issue?
YUNIKORN-2935
Before
There are no children, but we still allow users to click the collapse button.

After
No more collapse button when queue nodes don't have children.
