refactoring displayword to a module

displayword.lua

@@ -47,6 +47,10 @@ local generateLEDs = function(words, colorForground, colorMin1, colorMin2, color
  -- Set the local variables needed for the colored progress bar
  data={}
 
+ if (words == nil) then
+   return nil
+ end
+ 
  local minutes=1
  if (words.min1 == 1) then
    minutes = minutes + 1
@@ -249,6 +253,7 @@ M = {
     round        = round,
     drawLEDs     = drawLEDs,
     updateColor  = updateColor,
+    data         = data,
 }
 end
 return M