title: iText 5 getDefaultCell().setBorder(PdfPCell.NO_BORDER) has no effect
body: <p>I'm new with <strong>iText</strong> and I'm trying to build a table.
  But for some reason <code>table.getDefaultCell().setBorder(PdfPCell.NO_BORDER)</code> has no effect, my table has still borders.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>PdfPTable table = new PdfPTable(new float[] { 1, 1, 1, 1, 1 });
  table.getDefaultCell().setBorder(PdfPCell.NO_BORDER);
  Font tfont = new Font(Font.FontFamily.UNDEFINED, 10, Font.BOLD);
  table.setWidthPercentage(100);
  PdfPCell cell;
  cell = new PdfPCell(new Phrase("Menge", tfont));
  table.addCell(cell);
  cell = new PdfPCell(new Phrase("Beschreibung", tfont));
  table.addCell(cell);
  cell = new PdfPCell(new Phrase("Einzelpreis", tfont));
  table.addCell(cell);
  cell = new PdfPCell(new Phrase("Gesamtpreis", tfont));
  table.addCell(cell);
  cell = new PdfPCell(new Phrase("MwSt", tfont));
  table.addCell(cell);
  document.add(table);
  </code></pre>
  
  <p>Do you have any idea what I am doing wrong?</p>