fromfilename: Don't crash if title is missing

[9999years]

Prevents this crash:

$ beet import ~/Music/Music/_/[1405]/00.mp3
Traceback (most recent call last):
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/bin/.beet-wrapped", line 9, in <module>
    sys.exit(main())
             ~~~~^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/ui/__init__.py", line 1859, in main
    _raw_main(args)
    ~~~~~~~~~^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/ui/__init__.py", line 1838, in _raw_main
    subcommand.func(lib, suboptions, subargs)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/ui/commands.py", line 1390, in import_func
    import_files(lib, byte_paths, query)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/ui/commands.py", line 1330, in import_files
    session.run()
    ~~~~~~~~~~~^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/importer/session.py", line 234, in run
    pl.run_parallel(QUEUE_SIZE)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/util/pipeline.py", line 471, in run_parallel
    raise exc_info[1].with_traceback(exc_info[2])
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/util/pipeline.py", line 336, in run
    out = self.coro.send(msg)
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/util/pipeline.py", line 219, in coro
    func(*(args + (task,)))
    ~~~~^^^^^^^^^^^^^^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/importer/stages.py", line 141, in lookup_candidates
    plugins.send("import_task_start", session=session, task=task)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/plugins.py", line 505, in send
    result = handler(**arguments)
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beets/plugins.py", line 200, in wrapper
    return func(*args, **kwargs)
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beetsplug/fromfilename.py", line 165, in filename_task
    apply_matches(d, self._log)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/nix/store/lfv9ns20hz2bg6d44js378vcxjfm9261-beets-2.3.1/lib/python3.13/site-packages/beetsplug/fromfilename.py", line 124, in apply_matches
    item.title = str(d[item][title_field])
                     ~~~~~~~^^^^^^^^^^^^^
KeyError: 'title'

To Do

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

[github-actions]

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.

[Copilot]

Pull Request Overview

This PR fixes a crash in the fromfilename plugin that occurs when trying to import music files where the parsed filename data doesn't contain a title field. The fix prevents a KeyError by using a safe dictionary access method with a default fallback.

• Replace direct dictionary access with .get() method to handle missing title fields gracefully
• Use empty string as default value when title field is absent from parsed filename data

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.72%. Comparing base (5beb3d1) to head (c3960a2).

Files with missing lines	Patch %	Lines
beetsplug/fromfilename.py	0.00%	1 Missing ⚠️

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[snejus]

What sort of black magic removed the title from an item in your database?

[9999years]

@snejus I'm not sure. I've actually ended up with a couple null rows in my database (i.e. where every property is NULL or 0), which causes crashes in a number of places and (frustratingly) prevents the items from being queried for. Presumably transactions are not being used in some places, so crashes cause garbage data to be inserted?

[snejus]

Just add a note in the changelog and we should be good to go!