AwardExperienceAsync returned 0 for a character at the maximum level which has
not completed the master quest: it gains neither normal nor master experience.
Since the money of a kill is now derived from those returned values, such a
member got no zen at all in a party, while the same character still earns zen
when killing solo - AddExpAfterKillAsync returns the calculated amount there,
regardless of whether it could be applied.
The normal experience is now always calculated and returned, and only awarded
when the character can still gain it.
(cherry picked from commit 7cdb34b7c58f5924427b97ea17f26c3fe0f37719)
