coa.2: guard CoA data shapes (custom classes, comm-seeded records, ungeared chars)

Fixes login/UI crashes on Vol'jin - CoA Beta:
- DataStore_Inventory: GetAverageItemLevel returns 0 not nil (Altoholic sort
  + AccountSummary iLvl format); guard login AIL broadcast and 0/0 average.
- DataStore_Pets: GetNumPets returns 0 for unscanned companion table instead
  of assert-crashing TabCharacters.
- DataStore_Characters: GetColoredCharacterName tolerates nil name.
- Altoholic/Characters.lua: GetLineType returns nil for stale line id.

Stamp -coa.2 + X-Edited-By: Exiles on touched addons; README CoA changelog.

Altoholic/Altoholic.toc

@@ -1,18 +1,19 @@
 ## Interface: 30300
-## Title: Altoholic (|cFF69CCF0Telkar-RG|cFFFFFFFF 1.04a|r)
+## Title: Altoholic (|cFF69CCF0Telkar-RG|cFFFFFFFF 1.04a|r |cFFFFD100CoA|r)
 
 ## X-Curse-Packaged-Version: r90
 ## X-Curse-Project-Name: Altoholic
 ## X-Curse-Project-ID: altoholic
 ## X-Curse-Repository-ID: wow/altoholic/mainline
 
-## Notes: Provides information about your alts
+## Notes: Provides information about your alts (CoA fork)
 ## Notes-ruRU: Предоставляет информацию о вашем персонажах
 ## Notes-zhTW: 讓你即時撿閱你所有角色的資料
 ## Notes-zhCN: 能让你全面掌握你的所有角色的信息。
 
 ## Author: Thaoky, Telkar-RG
-## Version: 3.3.002b
+## X-Edited-By: Exiles (Sub-Net) — florian.berthold@sub-net.at
+## Version: 3.3.002b-coa.2
 ## X-Category: Inventory, Tradeskill, Mail
 ## X-Localizations: enUS, frFR, zhCN, zhTW, deDE, koKR, esES, esMX, ruRU
 ## X-Website: http://wow.curse.com/downloads/wow-addons/details/altoholic.aspx