Fix #79248: Traversing empty VT_ARRAY throws com_exception

If the `VT_ARRAY` is empty, i.e. its upperbound is less than its lower
bound, we must not call `php_com_safearray_get_elem()`,

Fix #79248: Traversing empty VT_ARRAY throws com_exception

If the `VT_ARRAY` is empty, i.e. its upperbound is less than its lower
bound, we must not call `php_com_safearray_get_elem()`, because that
function throws in this case.

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