[disney] Avoid splitting NoneType

yt_dlp/extractor/disney.py

@@ -5,9 +5,9 @@ from ..utils import (
     determine_ext,
     int_or_none,
     join_nonempty,
+    traverse_obj,
     unified_strdate,
     update_url_query,
-    traverse_obj,
 )
 
 
@@ -182,7 +182,7 @@ class DisneyIE(InfoExtractor):
             'description': video_data.get('description') or video_data.get('short_desc'),
             'thumbnail': video_data.get('thumb') or video_data.get('thumb_secure'),
             'duration': int_or_none(video_data.get('duration_sec')),
-            'upload_date': unified_strdate(video_data.get('publish_date')) or re.sub(r'\D', '', video_data.get('content_date').split('T')[0]),
+            'upload_date': unified_strdate(video_data.get('publish_date')) or re.sub(r'\D', '', video_data.get('content_date', '').split('T')[0]),
             'formats': formats,
             'subtitles': subtitles,
         }