coa.17: comprehensive partial-data hardening + DataStore_Characters login scan + Skills strip cap

- Hardening sweep across DataStore_* (softened crash-asserts in Talents/Containers/Quests
  to graceful nil) + Altoholic frames (guarded remaining getter results).
- DataStore_Characters: scan on login (was ghost-gated -> name/level/class never populated;
  the core 'no character data' cause).
- Skills tab: cap inline professions at 6 (+N) so the strip stops overflowing into Cooking.

Altoholic/Tooltip.lua

@@ -380,7 +380,7 @@ local function GetItemCount(searchedID)
 					for tabID = 1, 6 do 
 						local tabCount = DataStore:GetGuildBankTabItemCount(guildKey, tabID, searchedID)
 						if tabCount > 0 then
-							table.insert(tabCounters,  format("%s: %s", WHITE .. DataStore:GetGuildBankTabName(guildKey, tabID), TEAL..tabCount))
+							table.insert(tabCounters,  format("%s: %s", WHITE .. (DataStore:GetGuildBankTabName(guildKey, tabID) or ""), TEAL..tabCount))		-- CoA: tab name nil on partial guild-bank data
 						end
 					end