Add option --ignore-no-formats-error

* Ignores the "no video format" and similar errors
* Experimental - Some extractors may still throw these errors

yt_dlp/extractor/corus.py

@@ -131,7 +131,7 @@ class CorusIE(ThePlatformFeedIE):
             formats.extend(self._parse_smil_formats(
                 smil, smil_url, video_id, namespace))
         if not formats and video.get('drm'):
-            raise ExtractorError('This video is DRM protected.', expected=True)
+            self.raise_no_formats('This video is DRM protected.', expected=True)
         self._sort_formats(formats)
 
         subtitles = {}