[a118] OnError Example #2

[SAbboushi]

ExAccumulator

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WinMove 0, 0, width, height, "non-existent window"

Uninitialized width and height cause "unassigned" warnings (which is not the point of the example).
Suggest

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WinMove 0, 0, width := 0, height := 0, "non-existent window"

[Ragnar]

If the UseUnset warning is converted to an error, this would theoretically be correct again, but in this case it doesn't hurt to change it anyway, as the focus is more on "non-existent window". Changed via PR #443.