style(tvdb): improved logging in case of a failure to enrich the TMDB show with TVDB data

[MagicLegend]

Description

• Fixes When there is a mismatch between TVDB and TMDB provide info on what caused the mismatch #2511

AI was used to provide context on what the function does. Code was written by hand using autocompletion.

How Has This Been Tested?

Still awaiting feedback from the reporter with reproduction steps. But if the interface definition is correct (i.e. the used fields are indeed not nullable), there should not be any further errors. I'll leave this PR as a draft until the reporter responds.

Possibly other log lines in this file should be updated as well?

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

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