Fix --skip-unavailable-fragments

Bug in d71fd41249
Closes #3437

yt_dlp/downloader/fragment.py

@@ -134,6 +134,8 @@ class FragmentFD(FileDownloader):
         return True
 
     def _read_fragment(self, ctx):
+        if not ctx.get('fragment_filename_sanitized'):
+            return None
         try:
             down, frag_sanitized = self.sanitize_open(ctx['fragment_filename_sanitized'], 'rb')
         except FileNotFoundError:
@@ -177,7 +179,7 @@ class FragmentFD(FileDownloader):
                 'ratelimit': self.params.get('ratelimit'),
                 'retries': self.params.get('retries', 0),
                 'nopart': self.params.get('nopart', False),
-                'test': self.params.get('test', False),
+                'test': False,
             }
         )
         tmpfilename = self.temp_name(ctx['filename'])

yt_dlp/utils.py

@@ -5258,6 +5258,7 @@ class Config:
 
 class WebSocketsWrapper():
     """Wraps websockets module to use in non-async scopes"""
+    pool = None
 
     def __init__(self, url, headers=None, connect=True):
         self.loop = asyncio.events.new_event_loop()