Fixes bugs reported by Matthieu Casanova:

- Searchfield get VK_HOME & VK_END events
	- Fix for Searchfield that get undefined  char
    - Fix for NPE in TreeContactList

src/net/java/sip/communicator/impl/gui/main/MainFrame.java

@@ -1465,33 +1465,12 @@ public boolean dispatchKeyEvent(KeyEvent e)
             TreePath selectionPath = contactList.getSelectionPath();
 
             // No matter who is the focus owner.
-            if (e.getKeyCode() == KeyEvent.VK_ENTER
-                || e.getKeyCode() == KeyEvent.VK_ESCAPE
-                || e.getKeyCode() == KeyEvent.VK_LEFT
-                || e.getKeyCode() == KeyEvent.VK_RIGHT
-                || e.getKeyCode() == KeyEvent.VK_UP
-                || e.getKeyCode() == KeyEvent.VK_DOWN
-                || e.getKeyCode() == KeyEvent.VK_PAGE_UP
-                || e.getKeyCode() == KeyEvent.VK_PAGE_DOWN
+            if (
+                e.getKeyChar() == KeyEvent.CHAR_UNDEFINED
+                || e.getKeyCode() == KeyEvent.VK_ENTER
                 || e.getKeyCode() == KeyEvent.VK_BACK_SPACE
-                || e.getKeyCode() == KeyEvent.VK_CONTROL
-                || e.getKeyCode() == KeyEvent.VK_ALT
-                || e.getKeyCode() == KeyEvent.VK_SHIFT
-                || e.getKeyCode() == KeyEvent.VK_META
                 || e.getKeyCode() == KeyEvent.VK_TAB
                 || e.getKeyCode() == KeyEvent.VK_SPACE
-                || e.getKeyCode() == KeyEvent.VK_F1
-                || e.getKeyCode() == KeyEvent.VK_F2
-                || e.getKeyCode() == KeyEvent.VK_F3
-                || e.getKeyCode() == KeyEvent.VK_F4
-                || e.getKeyCode() == KeyEvent.VK_F5
-                || e.getKeyCode() == KeyEvent.VK_F6
-                || e.getKeyCode() == KeyEvent.VK_F7
-                || e.getKeyCode() == KeyEvent.VK_F8
-                || e.getKeyCode() == KeyEvent.VK_F9
-                || e.getKeyCode() == KeyEvent.VK_F10
-                || e.getKeyCode() == KeyEvent.VK_F11
-                || e.getKeyCode() == KeyEvent.VK_F12
                 || (selectionPath != null
                     && selectionPath.getLastPathComponent() instanceof GroupNode
                     && (e.getKeyChar() == '+'

src/net/java/sip/communicator/impl/gui/main/contactlist/TreeContactList.java

@@ -817,6 +817,11 @@ public void mousePressed(MouseEvent e)
 
         TreePath path = this.getPathForLocation(e.getX(), e.getY());
 
+        // If we didn't find any path for the given mouse location, we have
+        // nothing to do here.
+        if (path == null)
+            return;
+
         // Select the node under the right button click.
         if (!path.equals(getSelectionPath())
             && (e.getModifiers() & InputEvent.BUTTON1_MASK) != 0