container id nil error

[Road-block]

134x ...\tradeDispenser\tradeDispenser_SlaveFrame.lua:78: attempt to concatenate local 'cID' (a nil value)
...\tradeDispenser\tradeDispenser_SlaveFrame.lua:78: in function <...\tradeDispenser\tradeDispenser_SlaveFrame.lua:3>

From quick code review it looks to me that this is happening due to
tradeDispenser_SlaveFrame.lua#L65

With Blizzard's new chat restrictions if the addon tries to send to SAY while not in an instance it gets blocked, so code never reaches that early return on L69.

What I did on my local copy as a sort of band-aid catch all fix is modify the tradeDispenserMessage function thus.

function tradeDispenserMessage(channel, message)
	channel = strupper(channel)
	if (channel=="WHISPER") then
		SendChatMessage(message, "WHISPER", tD_Loc[UnitFactionGroup("player")], tD_Temp.Target.Name)
	elseif (channel=="RAID" or channel=="PARTY" or channel=="GUILD" or channel=="YELL" or channel=="SAY" or channel=="BATTLEGROUND") then
		local retOK, err = pcall(SendChatMessage, message, channel)
		if not (retOK) then
			tradeDispenserVerbose(0,"Error: cannot send to '"..channel.."'("..tostring(err)..")")
		end
	else
		tradeDispenserVerbose(0,"Error: cannot use channel '"..channel.."'")
	end
end