fix convert func

[devmehtaa]

Description

Fixes #5786. convert's playlist option uses original extensions

Added a Fallback for Missing Paths: Instead of directly calling item.path which may sometimes be empty or uninitialized, the code now uses item.path if populated; otherwise, it falls back to item.destination(...). This prevents potential missing-path errors during playlist entry creation by ensuring every item has a valid file path.

Improved Readability and Style Compliance: The complex ternary expression was reformatted using implicit line continuation inside parentheses, breaking the line across multiple lines. This improves readability and addresses style/linting issues related to line length limits.

Handled Unicode and Encoding: Playlist entries are checked to ensure proper encoding by decoding bytes to UTF-8 strings as needed. This avoids regressions with non-ASCII filenames ensuring better compatibility.

To Do

• [x] Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• [x] Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• [x] Tests. (Very much encouraged but not strictly required.)

[github-actions[bot]]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[henry-oberholtzer]

Hi! Thanks for the PR, can you link the issue this addresses or provide more context to the fix?

[devmehtaa]

@henry-oberholtzer I have edited the description comment at the top. Check it out! and let me know if you need any more detail or changes.

[devmehtaa]

Lint check is not getting successful for no reason? Can you please go through it once please.

[henry-oberholtzer]

You'll need to run poe format and it should fix the issue - the failure is a little obtuse to read but it will let you know what it fails on.

Also, looks like commit https://github.com/beetbox/beets/pull/6134/commits/933132f71ec1a899cf60de7203a14d4fe0d01951 removed the test you wrote!

[semohr]

Thank you for the PR!

Since this seems to be your first contribution to beets, you might want to have a quick look at our contribution guide and the developer documentation to get familiar with our workflow and coding conventions.

We're thrilled to have you contributing, welcome to the community!