SYMPTOM:
The user would like to create a metric that displays an empty subtotal.
STEPS TO REPRODUCE:
1. Create a report with the Year attribute and the Profit and Revenue metrics
2. Edit the Revenue metric
3. In the Subtotals/Aggregation tab, change the Total Subtotal Function to none
4. The report with now display double dashes "--" for the subtotal
5. If the user would like to remove the double dashes, Select Data > Report Data Options in the report
6. In the Report Data Options window, select Display > Null Values
7. In the Aggregation Nulls field, uncheck Use Default and delete the double dashes
8. The report will now display an empty cell for the subtotal
