vaadin / vaadin-combo-box / 4297

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updated pageSizeObserver to check for negative values (#846)

* updated pageSizeObserver to check for negative values

Added a check for negative values to the pageSizeObserver, such that it will not allow negative values to be set for pageSize.
Similarly to setting non-number values or 0, setting a negative value should throw an exception.

* simplified expression for checking if pageSize is 0 or negative

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