Should not render the table cell border if the <td> is empty.

Source/core/rendering/RenderTableCell.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1201 matching lines @@
         return;
 
     LayoutRect paintRect = LayoutRect(paintOffset, pixelSnappedSize());
     paintBoxShadow(paintInfo, paintRect, style(), Normal);
 
     // Paint our cell background.
     paintBackgroundsBehindCell(paintInfo, paintOffset, this);
 
     paintBoxShadow(paintInfo, paintRect, style(), Inset);
 
-    if (!style()->hasBorder() || tableElt->collapseBorders())
+    if (!style()->hasBorder() || tableElt->collapseBorders() || (!firstChild() && document().inQuirksMode()))
         return;
 
     paintBorder(paintInfo, paintRect, style());
 }
 
 void RenderTableCell::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     if (style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
         return;
 
@@ skipping 42 matching lines @@
 
 RenderTableCell* RenderTableCell::createAnonymousWithParentRenderer(const RenderObject* parent)
 {
     RenderTableCell* newCell = RenderTableCell::createAnonymous(&parent->document());
     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), TABLE_CELL);
     newCell->setStyle(newStyle.release());
     return newCell;
 }
 
 } // namespace WebCore