Returns whether a faction is flagged as "inactive". "Inactive" factions behave no differently; the distinction only exists to allow players to hide factions they don't care about from the main display. Factions thus marked are automatically moved to an "Inactive" group at the end of the faction list.
See also Faction functions.
index- Index of an entry in the faction list; between 1 and GetNumFactions() (
isInactive- 1 if the faction is currently flagged as "inactive"; otherwise nil (