Bug 183336 birt:paramDef should process parameters which do not echo input.
Description: birt:paramDef should process parameters which do not echo input. Build number:2.2.0.v20070420 Steps to reproduce: 1. New a report with a parameter, string, tick on "do not echo input" option. 2. New a birt jsp file with content. <birt:parameterPage id="0" name="page" reportDesign="report.rptdesign" isCustom="true"> echo parameter:<birt:paramDef id="1" name="p_echo"/> <input type="submit" name="OK" value="submit"/> </birt:parameterPage> 3. Preview the jsp and input content in input box. Expected result: Input content is replaced with other signals as "*" Actual result: User can see the input content. Error log:N/A
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/taglib/ParamDefTag.java
* 
	 * @return
	 * @throws Exception
	 */
	protected boolean __validate( ) throws Exception
	{
		if ( !param.validate( ) )
			return false;
		
		Pattern p = Pattern.compile( "^\\w+$" ); 
		Matcher m = p.matcher( param.getId( ) );
		if ( !m.find( ) )
		{
			throw new JspTagException( BirtResources
					.getMessage( ResourceConstants.TAGLIB_INVALID_ATTR_ID ) );
		}
		
		if ( pageContext.findAttribute( param.getId( ) ) != null )
		{
			throw new JspTagException( BirtResources
					.getMessage( ResourceConstants.TAGLIB_ATTR_ID_DUPLICATE ) );
		}
		return true;
	}
	/**
	 * Handle event before doEndTag
	 */
	protected void __beforeEndTag( )
	{