Fixed blank lines being sent on disable

src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -591,6 +591,15 @@ public class LocalSession {
         }
     }
     
+    /**
+     * Gets the status of CUI support.
+     * 
+     * @return
+     */
+    public boolean hasCUISupport() {
+        return hasCUISupport;
+    }
+    
     /**
      * Sets the status of CUI support.
      * 

src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -110,10 +110,13 @@ public class WorldEditPlugin extends JavaPlugin {
      * Called on plugin disable.
      */
     public void onDisable() {
-        controller.clearSessions();
         for (Player player : getServer().getOnlinePlayers()) {
-            wrapPlayer(player).dispatchCUIHandshake();
+            LocalPlayer lPlayer = wrapPlayer(player);
+            if (controller.getSession(lPlayer).hasCUISupport()) {
+                lPlayer.dispatchCUIHandshake();
             }
+        }
+        controller.clearSessions();
         config.unload();
     }