Remove code duplication from series service

Description

We have found that the series service implementation implements two methods that are 100% the same as methods provided by already imported modules.

Let's clean this up.

Steps to reproduce

None

Status

Assignee

Unassigned

Reporter

Sven Stauber

Criticality

None

Tags (folksonomy)

None

Components

Fix versions

Affects versions

4.0

Priority

Trivial
Configure