Fix error related to extension and ignore none-existing file

- format now gets set on a per track basis, if no format was provided
  with the command
- the playlist-method now uses a get_track_data-method which doesn't
  return an unnecessary download-url
- if a file doesn't exist, the playlist still writes the filename of
  it into the file. Will definitely create broken output, if no format
  was provided, so we need to check if this breaks programs

funkwhale_cli/cli/tracks.py

@@ -92,12 +92,12 @@ async def track_download(
     async with ctx.obj["remote"]:
         progressbar = tqdm.tqdm(id, unit="Files")
         for i in progressbar:
-            download_url, format, track_data = await get_track_download_url(
+            download_url, extension, track_data = await get_track_download_url(
                 i, ctx.obj["remote"], format=format
             )
             logs.logger.info("Downloading from {}".format(download_url))
 
-            filename_params = extract_filename_params(track_data, format)
+            filename_params = extract_filename_params(track_data, extension)
 
             if directory:
                 filename = template.format(**filename_params)
@@ -151,6 +151,17 @@ async def track_download(
         logs.logger.info("Download complete")
 
 
+async def get_track_data(id, remote, format=None):
+    result = await remote.request("get", "api/v1/tracks/{}/".format(id))
+    result.raise_for_status()
+    payload = await result.json()
+
+    if not format and payload["uploads"]:
+        format = payload["uploads"][0]["extension"]
+
+    return format, payload
+
+
 @tracks.command("export-playlist")
 @click.argument("id", nargs=-1, required=True)
 @click.option("--format", "-f")
@@ -171,11 +182,11 @@ async def track_export_playlist(
     async with ctx.obj["remote"]:
         playlist = []
         for i in id:
-            _, format, track_data = await get_track_download_url(
+            extension, track_data = await get_track_data(
                 i, ctx.obj["remote"], format=format
             )
 
-            filename_params = extract_filename_params(track_data, format)
+            filename_params = extract_filename_params(track_data, extension)
             filename = base_path + template.format(**filename_params)
             playlist.append(filename)
         if directory: