maxima-to-sr exception in `sum(1/(5*n)-1/(5*n+1),n,2,oo)`

[Georgi Guninski]

```
n=var('n')
su1=sum(1/(5*n)-1/(5*n+1),n,2,oo);su1
```
RuntimeError: Encountered operator mismatch in maxima-to-sr translation

[dmo...@deductivepress.ca]

Thanks for reporting the bug. I opened issue #36770 to track this, and provided a diagnosis there.