Right aligned table cell breaks if content is only a space

[iclukas]

Starting from 3.6.0, a right aligned table cell containing only one or more spaces crashes the publisher.

<Layout xmlns="urn:speedata.de:2009/publisher/en"
  xmlns:sd="urn:speedata:2009/publisher/functions/en">
  <Trace grid="no" objects="yes"/>

  <Record element="data">
    <PlaceObject>
      <Table><Tr>
          <Td align="right">
            <Paragraph><Value> </Value></Paragraph>
          </Td>
      </Tr></Table>
    </PlaceObject>
  </Record>
</Layout>