void checkRequiredAttribute( String name, String value ) throws ExtensionException
protected boolean checkRequiredAttribute( String name, String value )
		void checkRequiredAttribute( String name, String value )				throws ExtensionException		{			if ( StringUtil.isBlank( value ) )				throw new ExtensionException( new String[]{name},						ExtensionException.DESIGN_EXCEPTION_VALUE_REQUIRED );		}