Bug 173582 Run servlet should not be affected by values in document.[0000]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
Set nullParams = getParameterValues( request, PARAM_ISNULL );
		boolean isFirst = true;
		while ( e.hasMoreElements( ) )
		{
			String paramName = (String) e.nextElement( );
			if ( paramName != null
					&& !paramName.equalsIgnoreCase( PARAM_ISNULL ) )
			{
				String paramValue = getParameter( request, paramName, false );
				if ( nullParams != null
						&& nullParams.remove( toUTFString( paramName ) )
						&& !paramName.equalsIgnoreCase( name ) ) 
				
				
				{
					paramName = urlEncode( paramName, ISO_8859_1_ENCODE );
					queryString += ( isFirst ? "" : PARAMETER_SEPARATOR ) + PARAM_ISNULL + EQUALS_OPERATOR + paramName; 
					isFirst = false;
					continue;
				}
				if ( paramName.equalsIgnoreCase( name ) )
				{
					paramValue = value;
				}
				paramName = urlEncode( paramName, ISO_8859_1_ENCODE );
				paramValue = urlEncode( paramValue, UTF_8_ENCODE );
				queryString += ( isFirst ? "" : PARAMETER_SEPARATOR ) + paramName + EQUALS_OPERATOR + paramValue; 
				isFirst = false;
			}
		}