feat(meta): substitute TBA for unnamed episodes

crates/arr-meta/src/lib.rs

@@ -25,4 +25,5 @@ pub use client::{TmdbClient, TmdbClientBuilder, DEFAULT_BASE_URL, DEFAULT_CACHE_
 pub use error::{Error, Result};
 pub use model::{
     Episode, ExternalIds, FindResults, Movie, MovieSearchResult, Season, Series, SeriesSearchResult,
+    UNTITLED_EPISODE,
 };

crates/arr-meta/src/model.rs

@@ -140,6 +140,10 @@ pub struct SeasonSummary {
     pub episode_count: u32,
 }
 
+/// Placeholder for an episode TMDB has not named yet. #121's refresh replaces
+/// it once TMDB fills the title in.
+pub const UNTITLED_EPISODE: &str = "TBA";
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Season {
     pub number: u32,
@@ -285,7 +289,13 @@ impl From<RawSeason> for Season {
                 .into_iter()
                 .map(|episode| Episode {
                     number: episode.episode_number,
-                    title: episode.name,
+                    // TMDB leaves an unaired episode's name empty; a placeholder
+                    // keeps "" out of search, filenames and the compat shim.
+                    title: if episode.name.is_empty() {
+                        UNTITLED_EPISODE.to_owned()
+                    } else {
+                        episode.name
+                    },
                     air_date: episode.air_date.as_deref().and_then(parse_date),
                 })
                 .collect(),