Trakt list error on IMDB ID's

[jeffski10]

Describe the bug
It seems pretty much every time I add a new show to my Trakt watchlist I get an error reported when medusa adds it to its DB.

To Reproduce

1. Add to trakt watchlist
2. Wait for medusa to sync watchlist
3. See error reported
4. Show is still added and then processed as normal

Every time I cross check the ID its valid so seems to be some issue with the fetch/validation step.

Log reports an error :

2020-05-09 10:17:57 INFO SHOWQUEUE-ADD :: [d9c31da] Starting to add show by Indexer Id: 79169
2020-05-09 10:17:54 INFO TRAKTCHECKER :: [d9c31da] Adding show 'Seinfeld' using indexer: 'tvdb' and ID: 79169
2020-05-09 10:17:54 WARNING TRAKTCHECKER :: [d9c31da] Invalid series id: tt0098904

Medusa (please complete the following information):

Medusa Info: | Branch: masterCommit: d9c31da063e6c4b4383749e19b27b13693a1b71e
Version: Unknown
Database: 44.15

Python Version: | 3.7.6 (default, Dec 21 2019, 02:28:04) [GCC 8.3.0]
SSL Version: | OpenSSL 1.1.1d 10 Sep 2019
OS: | Linux-4.14.24-qnap-x86_64-with
Locale: | en_US.UTF-8

Any suggestions why this might be happening and how I can stop the error appear when all actually worked fine in the end?

Additional context
Add any other context about the problem here.

[p0psicles]

I refactored the trakt implementation, also using a new trakt library and authentication method.
Looking for testers for this branch in pull request: #8916.
You'll need to know howto checkout a branch.