A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 15 September 2007
I have a personality with zero personality performing Shinjo's Courage. The Shinjo's Courage destroys a card. Is there an honor gain there for another player to react with Dirty Politics?
Simply put: Does an Honor gain of zero exist?
Similarly, if an in-clan personality with zero personality is purchased without the "clan discount"?
Zen Faulkes (rules official), 15 September 2007
Does an Honor gain of zero exist?
http://rules.l5r.com/The_Player#Family_Honor: "An Honor gain of 0 points is not considered a gain for things that check whether a gain happened; likewise an Honor loss of 0 points is not considered a loss for such things."