anchor.diff:  <%
       WikiContext wikiContext = wiki.createContext( request, "rss" );
       WikiPage    wikipage    = wikiContext.getPage();
  -    
  +
  +    if( wiki.getBaseURL().length() == 0 )
  +    {
  +        response.sendError( 500, "The jspwiki.baseURL property has not been defined for this wiki - cannot generate RSS" );
  +        return;
  +    }
  +
       NDC.push( wiki.getApplicationName()+":"+wikipage.getName() );    
   
       response.setContentType("text/xml; charset=UTF-8" );
  
positive.code:             itemBuffer.append("   <rdf:Description");
              if( wiki.pageExists(author) )
              {
                  itemBuffer.append(" link=\""+wiki.getViewURL(author)+"\"");
              }
              itemBuffer.append(">\n");
              itemBuffer.append("    <rdf:value>"+author+"</rdf:value>\n");
  
negative.code:             if( p.getVersion() > 1 )
              {
                  itemBuffer.append("  <wiki:diff>"+
                                    wiki.getAbsoluteURL( WikiContext.DIFF,
                                                         p.getName(),
                                                        "r1=-1" )+
                                    "</wiki:diff>\n");
              }
  
              //
  