Add song_fetch error checking

backend/src/song_fetch.py

@@ -51,7 +51,23 @@ def _lastfm_getinfo(name: str, artist: str) -> tuple[str, list[str]]:  # ( image
     )
 
 
-def lastfm_query_search(query: str) -> SongInfo:
+def _yt_search(query: str) -> tuple[str, str]:
+    ydl_opts = {
+        "format": "bestaudio",
+        "default_search": "ytsearch1",
+        "outtmpl": "%(title)s.%(ext)s",
+        "skip_download": True,
+    }
+
+    with yt_dlp.YoutubeDL(ydl_opts) as ydl:
+        info = ydl.extract_info(query, download=False)
+
+    first = info["entries"][0]
+
+    return first["track"], first["artists"][0]
+
+
+def query_search(query: str) -> SongInfo | None:
     name, artist = _lastfm_search(query)
 
     img_id, tags = _lastfm_getinfo(name, artist)