[krasview] Fix extraction (Closes #5228)

youtube_dl/extractor/krasview.py

@@ -40,8 +40,10 @@ class KrasViewIE(InfoExtractor):
         description = self._og_search_description(webpage, default=None)
         thumbnail = flashvars.get('image') or self._og_search_thumbnail(webpage)
         duration = int_or_none(flashvars.get('duration'))
-        width = int_or_none(self._og_search_property('video:width', webpage, 'video width'))
-        height = int_or_none(self._og_search_property('video:height', webpage, 'video height'))
+        width = int_or_none(self._og_search_property(
+            'video:width', webpage, 'video width', default=None))
+        height = int_or_none(self._og_search_property(
+            'video:height', webpage, 'video height', default=None))
 
         return {
             'id': video_id,