[spiegeltv] Skip invalid m3u8 manifests (closes #6157)

youtube_dl/extractor/spiegeltv.py

@@ -77,11 +77,13 @@ class SpiegeltvIE(InfoExtractor):
                     'rtmp_live': True,
                 })
             elif determine_ext(endpoint) == 'm3u8':
-                formats.extend(self._extract_m3u8_formats(
+                m3u8_formats = self._extract_m3u8_formats(
                     endpoint.replace('[video]', play_path),
                     video_id, 'm4v',
                     preference=1,  # Prefer hls since it allows to workaround georestriction
-                    m3u8_id='hls'))
+                    m3u8_id='hls', fatal=False)
+                if m3u8_formats is not False:
+                    formats.extend(m3u8_formats)
             else:
                 formats.append({
                     'url': endpoint,