Bug 207250 Check blank value for datetime type parameter from url.[0002][0705]
Description: Check blank value for datetime type parameter from url. Build number:2.3.0.v20071023 Steps to reproduce: 1. New a datetime parameter mydt,listbox, tick off isRequired. 2. Preview in external browser and add "&dt=" in url, press enter. Expected result: Error message to indicate blank value isn't allowed for this parameter. Actual result: No error message and blank value is accepted. I tried to new a jsp and use <birt:paramDef> to pass the blank value and the blank value is accepted,too. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
String dataType = ParameterDataTypeConverter
						.ConvertDataType( parameter.getDataType( ) );
				
				boolean isLocale = this.locParams.contains( paramName );
				List paramList = null;
				if ( paramObj instanceof List )
				{
					
					paramList = (List) paramObj;
				}
				else
				{
					paramList = new ArrayList( );
					paramList.add( paramObj );
				}
				for ( int i = 0; i < paramList.size( ); i++ )
				{
					try
					{
						
						Object paramValueObj = DataUtil.validate( paramName,
								dataType, format, (String) paramList.get( i ),
								locale, isLocale );
						paramList.set( i, paramValueObj );
					}
					catch ( ViewerValidationException e )
					{
						
						if ( IBirtConstants.SERVLET_PATH_PREVIEW
								.equalsIgnoreCase( request.getServletPath( ) ) )