If you try to use the Modify tag to replace a search expression with the empty string, WebEPG import fails immediately because the empty string is parsed as null. For example the following will fail:

  <Actions>
    <Modify channel="*" field="#DESCRIPTION" search="\<!\[CDATA\[" action="Replace"></Modify>
    <Modify channel="*" field="#DESCRIPTION" search="\]\]\>" action="Replace"></Modify>
  </Actions>