fix: handle errors in tvdb launch hooks, skip auth without key

[linuxdaemon]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.00%. Comparing base (840b40c) to head (ecbe43e).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
plugins/tvdb.py	50.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #875      +/-   ##
==========================================
- Coverage   87.01%   87.00%   -0.02%     
==========================================
  Files         280      280              
  Lines       20838    20843       +5     
  Branches     1780     1781       +1     
==========================================
+ Hits        18133    18134       +1     
- Misses       2348     2351       +3     
- Partials      357      358       +1     

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