The ABS Android client's Kotlin Book model declares
var tags: List<String> // non-nullable
and Jackson throws MissingKotlinParameterException when the field is
absent from /api/items/{id} responses. ApiHandler.getLibraryItem
WithProgress catches the exception and resolves cb(null), at which
point AbsDownloader silently aborts — the user sees no error, the
download just never starts.
Add Tags to LibraryItemMedia and initialise it to []string{} at
construction. Verified end-to-end: download URL the Android client
builds (/api/items/{id}/file/{ino}/download) returns HTTP 206 with
audio/mpeg bytes; the parent /api/items/{id} response now carries
"tags": [] so Jackson deserialises cleanly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
