Yeah, but as cheap as (and common) as 100 ohm resistors are, why not?
Maybe they changed the firmware (or its a gray jag specific issue), but I somehow I remember back in 2011 (the last time I worked hands on with jags directly) a missing terminator would knock out the last jag in the string (it happened before); the last jag became the terminator. In the case of a solo jag, that meant that the jag wouldn’t work at all.