Fixes some possible NullPointerExceptions.

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

@@ -742,12 +742,12 @@ private void initButtonsPanel(UIContact uiContact)
 
         // check for phone stored in contact info only
         // if telephony contact is missing
-        if(uiContact.getContactNode().getContactDescriptor().getDescriptor()
-            instanceof MetaContact && telephonyContact == null)
+        if(uiContact.getDescriptor() != null
+           && uiContact.getDescriptor() instanceof MetaContact
+           && telephonyContact == null)
         {
             MetaContact metaContact =
-                (MetaContact)uiContact.getContactNode().getContactDescriptor().
-                    getDescriptor();
+                (MetaContact)uiContact.getDescriptor();
             Iterator<Contact> contacts = metaContact.getContacts();
 
             while(contacts.hasNext() && !hasPhone)

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

@@ -1181,7 +1181,7 @@ private void dispatchEventToButtons(MouseEvent event)
         Component mouseComponent
             = renderer.findComponentAt(translatedX, translatedY);
 
-        if (logger.isDebugEnabled())
+        if (logger.isDebugEnabled() && mouseComponent != null)
             logger.debug("DISPATCH MOUSE EVENT TO COMPONENT: "
                     + mouseComponent.getClass().getName()
                     + " with bounds: " + mouseComponent.getBounds()

src/net/java/sip/communicator/util/swing/plaf/SIPCommTextFieldUI.java

@@ -179,19 +179,24 @@ protected void customPaintBackground(Graphics g)
 
             Rectangle deleteButtonRect = getDeleteButtonRect();
 
-            int dx = deleteButtonRect.x;
-            int dy = deleteButtonRect.y;
-
-            if (c.getText() != null
-                    && c.getText().length() > 0
-                    && isDeleteButtonEnabled)
+            if(deleteButtonRect != null)
             {
-                if (isDeleteMouseOver)
-                    g2.drawImage(deleteButtonRolloverImg, dx, dy, null);
+                int dx = deleteButtonRect.x;
+                int dy = deleteButtonRect.y;
+
+                if (c.getText() != null
+                        && c.getText().length() > 0
+                        && isDeleteButtonEnabled)
+                {
+                    if (isDeleteMouseOver)
+                        g2.drawImage(deleteButtonRolloverImg, dx, dy, null);
+                    else
+                        g2.drawImage(deleteButtonImg, dx, dy, null);
+
+                    isDeleteIconVisible = true;
+                }
                 else
-                    g2.drawImage(deleteButtonImg, dx, dy, null);
-
-                isDeleteIconVisible = true;
+                    isDeleteIconVisible = false;
             }
             else
                 isDeleteIconVisible = false;
@@ -267,6 +272,9 @@ protected Rectangle getDeleteButtonRect()
     {
         JTextComponent c = getComponent();
 
+        if(c == null)
+            return null;
+
         Rectangle rect = c.getBounds();
 
         int dx = rect.width - deleteButton.getWidth() - BUTTON_GAP - 5;
@@ -292,6 +300,9 @@ protected Rectangle getVisibleEditorRect()
         }
 
         JTextComponent c = getComponent();
+        
+        if(c == null)
+            return null;
 
         Rectangle alloc = c.getBounds();
 
@@ -439,7 +450,8 @@ public void mouseMoved(MouseEvent e)
 
     private void updateCursor(MouseEvent mouseEvent)
     {
-        if (getVisibleEditorRect().contains(mouseEvent.getPoint()))
+        Rectangle rect = getVisibleEditorRect();
+        if (rect != null && rect.contains(mouseEvent.getPoint()))
         {
             getComponent().setCursor(
                 Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR));