[bpb] Improve (closes #14086)

youtube_dl/extractor/bpb.py

@@ -33,13 +33,18 @@ class BpbIE(InfoExtractor):
         title = self._html_search_regex(
             r'<h2 class="white">(.*?)</h2>', webpage, 'title')
         video_info_dicts = re.findall(
-            r"({\s*src\s*:\s*'https://film\.bpb\.de/[^}]+})", webpage)
+            r"({\s*src\s*:\s*'https?://film\.bpb\.de/[^}]+})", webpage)
 
         formats = []
         for video_info in video_info_dicts:
-            video_info = self._parse_json(video_info, video_id, transform_source=js_to_json)
-            video_url = video_info['src']
-            quality = 'high' if re.search(r'_high\.', video_url) else 'low'
+            video_info = self._parse_json(
+                video_info, video_id, transform_source=js_to_json, fatal=False)
+            if not video_info:
+                continue
+            video_url = video_info.get('src')
+            if not video_url:
+                continue
+            quality = 'high' if '_high' in video_url else 'low'
             formats.append({
                 'url': video_url,
                 'preference': 10 if quality == 'high' else 0,