Update additional test cases

# Conflicts:
#	yt_dlp/extractor/cbc.py
#	yt_dlp/extractor/mediaset.py
#	yt_dlp/extractor/nbc.py

yt_dlp/extractor/aenetworks.py

@@ -121,11 +121,21 @@ class AENetworksIE(AENetworksBaseIE):
         'info_dict': {
             'id': '22253814',
             'ext': 'mp4',
-            'title': 'Winter is Coming',
+            'title': 'Winter Is Coming',
-            'description': 'md5:641f424b7a19d8e24f26dea22cf59d74',
+            'description': 'md5:a40e370925074260b1c8a633c632c63a',
             'timestamp': 1338306241,
             'upload_date': '20120529',
             'uploader': 'AENE-NEW',
+            'duration': 2592.0,
+            'thumbnail': r're:^https?://.*\.jpe?g$',
+            'chapters': 'count:5',
+            'tags': 'count:14',
+            'categories': ['Mountain Men'],
+            'episode_number': 1,
+            'episode': 'Episode 1',
+            'season': 'Season 1',
+            'season_number': 1,
+            'series': 'Mountain Men',
         },
         'params': {
             # m3u8 download
@@ -143,6 +153,15 @@ class AENetworksIE(AENetworksBaseIE):
             'timestamp': 1452634428,
             'upload_date': '20160112',
             'uploader': 'AENE-NEW',
+            'duration': 1277.695,
+            'thumbnail': r're:^https?://.*\.jpe?g$',
+            'chapters': 'count:4',
+            'tags': 'count:23',
+            'episode': 'Episode 1',
+            'episode_number': 1,
+            'season': 'Season 9',
+            'season_number': 9,
+            'series': 'Duck Dynasty',
         },
         'params': {
             # m3u8 download

yt_dlp/extractor/cbc.py

@@ -205,7 +205,7 @@ class CBCPlayerIE(InfoExtractor):
             'series': 'CBC News: Windsor at 6:00',
             'categories': ['News/Canada/Windsor'],
             'location': 'Windsor',
-            'tags': ['cancer'],
+            'tags': 'count:1',
             'creator': 'Allison Johnson',
             'media_type': 'Excerpt',
         },

yt_dlp/extractor/cwtv.py

@@ -46,6 +46,10 @@ class CWTVIE(InfoExtractor):
             'timestamp': 1444107300,
             'age_limit': 14,
             'uploader': 'CWTV',
+            'thumbnail': r're:^https?://.*\.jpe?g$',
+            'chapters': 'count:4',
+            'episode': 'Episode 20',
+            'season': 'Season 11',
         },
         'params': {
             # m3u8 download

yt_dlp/extractor/theplatform.py

@@ -106,7 +106,7 @@ class ThePlatformBaseIE(OnceIE):
 
         def extract_site_specific_field(field):
             # A number of sites have custom-prefixed keys, e.g. 'cbc$seasonNumber'
-            return next((info[k] for k in info if k.endswith(f'${field}') and info[k] != ''), None)
+            return traverse_obj(info, lambda k, v: v and k.endswith(f'${field}'), get_all=False)
 
         return {
             'title': info['title'],