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fix "Lua error in Module:WikidataCheck at line 35: attempt to index field 'datavalue' (a nil value)" at BattleTech due to missing value on Wikidata
local p = {}

function p.wikidatacheck(frame)
local pframe = frame:getParent()
local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
local args = pframe.args -- the arguments passed TO the template, in the wikitext that transcludes the template

local property = config.property
local value = config.value or ""
local catbase = config.category
local namespaces = config.namespaces
local ok = false -- one-way flag to check if we're in a good namespace
local ns = mw.title.getCurrentTitle().namespace
for v in mw.text.gsplit( namespaces, ",", true) do
if tonumber(v) == ns then
ok = true
end
end
if not ok then -- not in one of the approved namespaces
return ""
end
local entity = mw.wikibase.getEntityObject()
if not entity then -- no Wikidata item
return "[[Category:" .. catbase .. " not in Wikidata]]"
end
if value == "" then
return nil -- Using Wikidata
end
local claims = entity.claims or {}
local hasProp = claims[property]
if not hasProp then -- no claim of that property
return "[[Category:" .. catbase .. " not in Wikidata]]" -- bad. Bot needs to add the property
end
for i, v in ipairs(hasProp) do -- Now we try to iterate over all possible values?
propValue = (v.mainsnak.datavalue or {}).value
if propValue == value then
return "[[Category:" .. catbase .. " same as Wikidata]]" -- yay!
end
end
return "[[Category:" .. catbase .. " different from Wikidata]]" -- needs human review :(
end

return p
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