Empty paragraph should have effect of newline

[pgundlach]

<Layout xmlns="urn:speedata.de:2009/publisher/en" xmlns:sd="urn:speedata:2009/publisher/functions/en">
  <Pageformat height="5cm" width="4cm" />
  <Record element="data">
    <PlaceObject>
      <Textblock>
        <Paragraph>
          <Value>a</Value>
        </Paragraph>
        <Paragraph>
          <Value></Value>
        </Paragraph>
        <Paragraph>
          <Value>b</Value>
        </Paragraph>
      </Textblock>
    </PlaceObject>
  </Record>
</Layout>

should render as

a

b

and not as

a
b