Fix CID 1386106 (Explicit null dereferenced)

Handle also the case when the user closes the dialog
without selecting an answer.

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

java/com/google/scrollview/ui/SVWindow.java

@@ -606,20 +606,18 @@ public void showInputDialog(String msg) {
    * Shows a dialog presenting "Yes" and "No" as answers and returns either a
    * "y" or "n" to the client.
    *
+   * Closing the dialog without answering is handled like "No".
+   *
    * @param msg The text that is displayed in the dialog.
    */
   public void showYesNoDialog(String msg) {
     // res returns 0 on yes, 1 on no. Seems to be a bit counterintuitive
     int res =
         JOptionPane.showOptionDialog(this, msg, "", JOptionPane.YES_NO_OPTION,
             JOptionPane.QUESTION_MESSAGE, null, null, null);
-    SVEvent e = null;
 
-    if (res == 0) {
-      e = new SVEvent(SVEventType.SVET_INPUT, this, 0, 0, 0, 0, "y");
-    } else if (res == 1) {
-      e = new SVEvent(SVEventType.SVET_INPUT, this, 0, 0, 0, 0, "n");
-    }
+    SVEvent e = new SVEvent(SVEventType.SVET_INPUT, this, 0, 0, 0, 0,
+                            res == 0 ? "y" : "n");
     ScrollView.addMessage(e);
   }