Fix CID 1386083 (Dereference null return value)

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: stweil

java/com/google/scrollview/events/SVEventHandler.java

@@ -28,6 +28,7 @@
 import java.awt.event.KeyListener;
 import java.awt.event.WindowEvent;
 import java.awt.event.WindowListener;
+import java.awt.Window;
 
 import javax.swing.Timer;
 
@@ -262,7 +263,10 @@ public void keyPressed(KeyEvent e) {
   public void windowClosing(WindowEvent e) {
     processEvent(new SVEvent(SVEventType.SVET_DESTROY, svWindow, lastXMove,
         lastYMove, 0, 0, null));
-    e.getWindow().dispose();
+    Window w = e.getWindow();
+    if (w != null) {
+      w.dispose();
+    }
     SVWindow.nrWindows--;
     if (SVWindow.nrWindows == 0) {
       processEvent(new SVEvent(SVEventType.SVET_EXIT, svWindow, lastXMove,