Bug 141255 No error for the incompatible parameter value
Steps to reproduce: 1.New a decimal parameter, set the default value to "aaa" 2.Preview the report by "Preview" tab Expected result: Error to say the incompatible parameter value Actual result: Parameter request page keeps poping up till input the decimal value Note: if preview in Web Viewer, error will be thrown out, but no exception description.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
title = BirtResources
					.getString( ResourceConstants.BIRT_VIEWER_TITLE );
		}
		this.reportTitle = ParameterAccessor.htmlEncode( title );
		this.__initParameters( request );
	}
	/*
	 * Prepare the report parameters
	 */
	protected void __initParameters( HttpServletRequest request )
			throws Exception
	{
		this.reportDesignHandle = getDesignHandle( request );
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		options.setOption( InputOptions.OPT_LOCALE, locale );
		options.setOption( InputOptions.OPT_RTL, new Boolean( rtl ) );
		this.parameterList = this.getReportService( ).getParameterDefinitions(
				reportDesignHandle, options, false );
		
		if ( isDesigner )
		{
			this.parseConfigVars( request );
		}
		
		this.parameters = (HashMap) getParsedParameters( reportDesignHandle,
				parameterList, request, options );
		this.missingParameter = validateParameters( parameterList,
				this.parameters );
	}