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.

DataStore_Crafts/DataStore_Crafts.lua

@@ -625,6 +625,9 @@ local function _GetProfessionInfo(profession)
 end
 
 local function _GetNumCraftLines(profession)
+	-- CoA: profession is nil for an unscanned/custom profession on a partial-data alt;
+	-- callers use this as a numeric `for` limit, so return 0 instead of crashing on #nil.Crafts
+	if type(profession) ~= "table" or type(profession.Crafts) ~= "table" then return 0 end
 	return #profession.Crafts
 end
 	
@@ -709,7 +712,7 @@ local function _GetNumRecipesByColor(profession)
 	for i = 1, _GetNumCraftLines(profession) do
 		local isHeader, color = _GetCraftLineInfo(profession, i)
 		
-		if not isHeader then
+		if not isHeader and color and counts[color] then		-- CoA: custom-profession craft lines can carry an out-of-range/nil color
 			counts[color] = counts[color] + 1
 		end
 	end