I've taken a look and I can't quite figure out the pivot table you're trying to create. Pivot tables will treat blanks as zeroes when aggregating (adding, counting, etc.), and will group blank entries together when using them as categories.
If you can show me an example of what you want to create I should be able to offer further advice.
For anyone looking for more information about pivot tables, they are covered in depth in: Expert Skills Session 8: Pivot Tables.
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