Fixed a bug with the /way slash command, when used without arguments

diff --git a/TomTom.lua b/TomTom.lua
index 5895209..1e1666f 100755
--- a/TomTom.lua
+++ b/TomTom.lua
@@ -857,7 +857,9 @@ SlashCmdList["WAY"] = function(msg)
 	for token in msg:gmatch("%S+") do table.insert(tokens, token) end

 	-- Lower the first token
-	tokens[1] = tokens[1]:lower()
+	if tokens[1] then
+		tokens[1] = tokens[1]:lower()
+	end

 	if tokens[1] == "reset" then
 		if tokens[2] == "all" then