Module:If empty

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This module supports Template:If empty. See here for test cases.

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local p = {}

function p.main(frame)
	local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false})

	-- For backwards compatibility reasons, the first 9 parameters can be unset instead of being blank,
	-- even though there's really no legitimate use case for this. At some point, this will be removed.
	for i = 1,9 do
		if args[i] == nil then
			args[i] = ''
		end
	end

	for _,v in ipairs(args) do
		if v ~= '' then
			return v
		end
	end
end

return p