errors during tests are now handled

I should have documented that I'd never actually seen that code path
trigger before. Here's a minimal test that did it just now:

  function test_foo()
    return a+1
  end

  E2: [string "test_foo"]:2: attempt to perform arithmetic on global 'a' (a nil value)

A simple missing variable doesn't do it since it just evaluates to nil.

Without this commit, the above test was silently continuing to the main
app after failing tests.

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