Fix tabs without onTouch

orders.lua

@@ -89,10 +89,6 @@ local function estimatedHeight()
     return listframes.estimatedHeight()
 end
 
-local function onTouch(self, touch_x, touch_y)
-    return false
-end
-
 
 return {
     name="orders",
@@ -100,5 +96,4 @@ return {
     fetch=fetch,
     displayTab=displayTab,
     estimatedHeight=estimatedHeight,
-    onTouch=onTouch,
 }

tabview.lua

@@ -84,6 +84,7 @@ end
 
 local function onTouch(touchX, touchY)
     if currentTab ~= nil and
+            currentTab.onTouch ~= nil and
             winhlp.contains(currentTab.window, touchX, touchY) and
             currentTab.onTouch(currentTab, winhlp.translate(currentTab.window, touchX, touchY)) then
         return true