[extractor/youku] Improve error message (#6690)

Authored by: carusocr
Closes #6551

yt_dlp/extractor/youku.py

@@ -6,6 +6,7 @@
 from .common import InfoExtractor
 from ..utils import (
     ExtractorError,
+    clean_html,
     get_element_by_class,
     js_to_json,
     str_or_none,
@@ -26,48 +27,8 @@ class YoukuIE(InfoExtractor):
     '''
 
     _TESTS = [{
-        # MD5 is unstable
-        'url': 'http://v.youku.com/v_show/id_XMTc1ODE5Njcy.html',
-        'info_dict': {
-            'id': 'XMTc1ODE5Njcy',
-            'title': '★Smile﹗♡ Git Fresh -Booty Music舞蹈.',
-            'ext': 'mp4',
-            'duration': 74.73,
-            'thumbnail': r're:^https?://.*',
-            'uploader': '。躲猫猫、',
-            'uploader_id': '36017967',
-            'uploader_url': 'http://i.youku.com/u/UMTQ0MDcxODY4',
-            'tags': list,
-        }
-    }, {
         'url': 'http://player.youku.com/player.php/sid/XNDgyMDQ2NTQw/v.swf',
         'only_matching': True,
-    }, {
-        'url': 'http://v.youku.com/v_show/id_XODgxNjg1Mzk2_ev_1.html',
-        'info_dict': {
-            'id': 'XODgxNjg1Mzk2',
-            'ext': 'mp4',
-            'title': '武媚娘传奇 85',
-            'duration': 1999.61,
-            'thumbnail': r're:^https?://.*',
-            'uploader': '疯狂豆花',
-            'uploader_id': '62583473',
-            'uploader_url': 'http://i.youku.com/u/UMjUwMzMzODky',
-            'tags': list,
-        },
-    }, {
-        'url': 'http://v.youku.com/v_show/id_XMTI1OTczNDM5Mg==.html',
-        'info_dict': {
-            'id': 'XMTI1OTczNDM5Mg',
-            'ext': 'mp4',
-            'title': '花千骨 04',
-            'duration': 2363,
-            'thumbnail': r're:^https?://.*',
-            'uploader': '放剧场-花千骨',
-            'uploader_id': '772849359',
-            'uploader_url': 'http://i.youku.com/u/UMzA5MTM5NzQzNg==',
-            'tags': list,
-        },
     }, {
         'url': 'http://v.youku.com/v_show/id_XNjA1NzA2Njgw.html',
         'note': 'Video protected with password',
@@ -81,6 +42,7 @@ class YoukuIE(InfoExtractor):
             'uploader_id': '322014285',
             'uploader_url': 'http://i.youku.com/u/UMTI4ODA1NzE0MA==',
             'tags': list,
+            'skip': '404',
         },
         'params': {
             'videopassword': '100600',
@@ -192,7 +154,7 @@ def _real_extract(self, url):
             else:
                 msg = 'Youku server reported error %i' % error.get('code')
                 if error_note is not None:
-                    msg += ': ' + error_note
+                    msg += ': ' + clean_html(error_note)
                 raise ExtractorError(msg)
 
         # get video title