coa.3: guard XP getters in DataStore_Characters for partial records

GetXPRate / GetRestXPRate did raw arithmetic on character.XP / .XPMax /
.lastLogoutTimestamp, which are nil for own alts seen via guild comm but
never fully scanned. Crashed AccountSummary on Vol'jin - CoA Beta.

DataStore_Characters/DataStore_Characters.lua

@@ -206,7 +206,9 @@ local function _GetXP(character)
 end
 
 local function _GetXPRate(character)
-	return floor((character.XP / character.XPMax) * 100)
+	local xpMax = character.XPMax or 0		-- CoA: comm-seeded / max-level / unscanned char has no XP data (also avoids /0)
+	if xpMax == 0 then return 0 end
+	return floor(((character.XP or 0) / xpMax) * 100)
 end
 
 local function _GetXPMax(character)
@@ -234,7 +236,7 @@ local function _GetRestXPRate(character)
 		-- divide rest xp by this value	20400 / 204 = 100	==> rest xp rate
 	
 	local rate = 0
-	if character.RestXP then
+	if character.RestXP and character.XPMax and character.XPMax > 0 then		-- CoA: guard nil/zero XPMax
 		rate = (character.RestXP / ((character.XPMax / 100) * 1.5))
 	end
 	
@@ -242,7 +244,7 @@ local function _GetRestXPRate(character)
 	-- (elapsed time / 3600) * 0.625 * (2/3)  simplifies to elapsed time / 8640
 	-- 0.625 comes from 8 hours rested = 5% of a level, *2/3 because 100% rested = 150% of xp (1.5 level)
 
-	if character.lastLogoutTimestamp ~= 0 then		-- time since last logout, 0 for current char, <> for all others
+	if character.lastLogoutTimestamp and character.lastLogoutTimestamp ~= 0 then		-- time since last logout, 0 for current char, <> for all others (CoA: nil for comm-seeded chars => "nil ~= 0" is true and crashed)
 		if character.isResting then
 			rate = rate + ((time() - character.lastLogoutTimestamp) / 8640)
 		else