There is an inconsistency between getHyperLinkCount and getHyperLink,
as the latter uses index 0 as a no-op for some ToC link that was never
implemented, so all the real hyperlinks have their index offset by 1.

Also it's pointless to call getHyperLinkCount once per loop iteration.

(regression from 76c549eb)

Change-Id: Iec83b6680abbdff5d372ca40358bd1306f3bd991