Bug 198917 set __parameterpage to false for required parameter will cause wrong Exception[0705]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
{
		ParameterValidationException engineException;
		boolean visitScalarParameter( ScalarParameterHandle param,
				Object value )
		{
			try
			{
				return validateScalarParameter( param );
			}
			catch ( ParameterValidationException pe )
			{
				engineException = pe;
			}
			return false;
		}
		boolean visitParameterGroup( ParameterGroupHandle group,
				Object value )
		{
			return visitParametersInGroup( group, value );
		}
	};
	protected void loggerParamters( )
	{
		if ( log.isLoggable( Level.FINE ) )
		{