function _getSafeElemSize (oElement) {
    oElement = $.getElement( oElement );

    return new $.Point(
        (oElement.clientWidth === 0 ? 1 : oElement.clientWidth),
        (oElement.clientHeight === 0 ? 1 : oElement.clientHeight)
    );
}
_getSafeElemSize is like getElementSize(), but refuses to return 0 for x or y,
which was causing some calling operations to return NaN.
@returns {Point}
@private