ArgsTable: Gracefully handle conditional args failures

[shilman]

Issue: #18177

self-merging @tmeasday

What I did

Swallow manager errors so that the UI doesn't crash when the user has specified an invalid condition.
Before the UI would whitescreen. Now:

How to test

Add an invalid conditional to any example, e.g.

  argTypes: {
    onClick: { action: 'click ', if: {} },
  }

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