Multiple <Br/>s shrink to a single <Br/>

[iclukas]

Since 3.7.17 multiple <Br/>s no longer produce blank lines.

It tested the many revisions since 3.7.1 and could localise the offending change: 5af208f#diff-8459393eeac209a1dfa8681c04ed59b1

<Layout
  xmlns="urn:speedata.de:2009/publisher/en"
  xmlns:sd="urn:speedata:2009/publisher/functions/en">
  <Pageformat width="210mm" height="60mm"/>

  <Options bleed="3mm" cutmarks="yes" />
  <Record element="data">
     <PlaceObject>
       <Textblock>
         <Paragraph>
           <Value>Lorem ipsum dolor sit amet,</Value>
           <Br/><Br/>
           <Value>consectetur adipisicing elit</Value>
         </Paragraph>
       </Textblock>
     </PlaceObject>
   </Record>
</Layout>

[pgundlach]

I think you are right and I should re-implement multiple br.

[pgundlach]

See also #235