To fix it you could add the filter
au.type_desc = ‘IN_ROW_DATA’

or better, use a dmv:
SELECT OBJECT_NAME(i.OBJECT_ID) AS ‘tableName’
, i.name AS ‘indexName’
, i.type_desc
, MAX(p.partition_number) AS ‘partitions’
, SUM(p.row_count) AS ‘rows’
, SUM(p.in_row_data_page_count) AS ‘dataPages’
, SUM(p.row_count) / SUM(p.in_row_data_page_count) AS ‘rowsPerPage’
FROM sys.indexes AS i
JOIN sys.dm_db_partition_stats AS p
ON i.OBJECT_ID = p.OBJECT_ID
And i.index_id = p.index_id
WHERE OBJECT_NAME(i.OBJECT_ID) Not Like ‘sys%’
GROUP BY OBJECT_NAME(i.OBJECT_ID)
, i.name
, i.type_desc
HAVING SUM(p.in_row_data_page_count) > 100
ORDER BY rowsPerPage;

And for *further* understanding of the structure of a database, I like to use SQL Internals Viewer by Danny Gould: http://www.sqlinternalsviewer.com It tells you where everything is down to the very last bit.