Leading Comma for Genres

[Katazui]

Issue Fixed

The PR addresses a bug in note field processing where:

1. Empty note fields were incorrectly processed - split(',') on an empty string created an array with one empty string element
2. This empty string was being added to metadata as a legitimate tag value

Fixes #447 - Prevents empty attributes from appearing in tags panel and being saved

Changes Made

- let note = this.tags[field]??[];
+ let noteValues = this.tags[field] ?? [];
  
- return note.join(',');
+ return this.processNoteString(noteValues.join(',')).join(',');

- for (let value of this.note.split(',')) {
-   if (value.trim())
-     out.push({value, type: 'note', index: I});
+ for (let value of this.processNoteString(this.note)) {
+   out.push({value: value, type: 'note', index: I});

New Helper Methods Added

// Process note string
processNoteString(noteStr: string | undefined): string[] {
    if (!noteStr) return [];
    return noteStr.split(',')
        .map(n => n.trim())
        .filter(n => n.length > 0);
}

// Similar method for genres
processGenreArray(genres: string[]): string[] {
    return genres
        .map(g => g.trim())
        .filter(g => g.length > 0);
}

These changes ensure empty values are properly filtered out when processing both note and genre fields, preventing unwanted empty tags.

[Marekkon5]

Hello, thank you very much for the PR, tested locally and it is working. I only noticed that there is one unused function, would you please remove it or use it?

Thank you.

[Marekkon5]

The unused function is still there, is this intentional?

[Katazui]

Honestly, that was my mistake, working late nights!