[youtube] Handle cases where format comes without a preference (Fixes #4648)
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		| @@ -1046,7 +1046,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor): | ||||
|                     for f in formats: | ||||
|                         if f['format_id'] in dash_keys: | ||||
|                             f['format_id'] = 'nondash-%s' % f['format_id'] | ||||
|                             f['preference'] -= 10000 | ||||
|                             f['preference'] = f.get('preference', 0) - 10000 | ||||
|                     formats.extend(dash_formats) | ||||
|  | ||||
|         self._sort_formats(formats) | ||||
|   | ||||
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	 Philipp Hagemeister
					Philipp Hagemeister