I observed this data but I'm unsure about the root cause. It could be
that the SQL query fetching this data needs tweaking to return the fee
name in this case or it could be that it's not available (deleted).
In any case, I thought I document what's happening and make this
summarizer more robust before looking into the query.
I changed the used parameter names within the report so that we don't
have to rename the given parameter names when the report runs. This
avoids modifying the `params` object and therefore other problems.
The Enterprise Fee Summary report modified the `params` object. So when
we pass the same `params` a second time to the report class it doesn't
find the same values. In some cases that would lead to a server error.
The next commit implements a better solution though.
