Bug 135207 parameter dialog is not displayed when drill through to a PDF report that contains parameter with no default value
steps to reproduce: - create 1st report - add a report parameter (no default value) - create 2nd report - add a label "link" - edit hyperlink property (type: drill-through, target report format: PDF) - preview 1st report - click on "link" expected behavior: - parameter dialog should be displayed - target report is rendered in PDF format actual behavior: - "Some required parameter values are not set or set to incompatible data type." was displayed instead.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/servlet/ViewerServlet.java
else if ( "/parameter".equalsIgnoreCase( servletPath ) ) 
		{
			activeFragment = parameter;
		}
		activeFragment.service( context.getRequest( ), context.getResponse( ) );
	}
	/**
	 * Locale process http request with POST method. Four different servlet
	 * paths are expected: "/frameset", "/navigation", "/toolbar", and "/run".
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @exception ServletException
	 * @exception IOException
	 * @return
	 */
	protected boolean __doPost( IContext context ) throws ServletException,
			IOException, BirtException
	{
		if ( "/download".equalsIgnoreCase( context.getRequest( ).getServletPath( ) ) ) 
		{
			engine.service( context.getRequest( ), context.getResponse( ) );
			return false;
		}
		return true;
	}
	/**
	 * Local authentication. Alwasy returns true.