InputWrapper: opt out early if session == null

Change-Id: If111195ba6425ad6b8663601566f9f260738ec77

Author: kufikugel

core/java/android/inputmethodservice/IInputMethodWrapper.java

@@ -283,6 +283,10 @@ public void createSession(InputChannel channel, IInputSessionCallback callback)
 
     @Override
     public void setSessionEnabled(IInputMethodSession session, boolean enabled) {
+        if (session == null) {
+            Log.w(TAG, "Incoming session is null");
+            return;
+        }
         try {
             InputMethodSession ls = ((IInputMethodSessionWrapper)
                     session).getInternalInputMethodSession();