fix if no transcript is available

app.py

@@ -210,7 +210,14 @@ def get_transcript(video_id):
     transcript_list = yta.list_transcripts(video_id)
 
     transcript_raw = None
-    transcript_item = transcript_list.find_transcript(['en'])
+    try:
+        transcript_item = transcript_list.find_transcript(['en'])
+    except NoTranscriptFound:
+        transcript_item = None
+        transcript_text = None
+        transcript_item_is_generated = False
+        return transcript_text, transcript_item_is_generated
+    
     transcript_item_is_generated = transcript_item.is_generated
     transcript_raw = transcript_item.fetch()
 
@@ -585,6 +592,9 @@ if st.button('Load Sequence'):
             
             transcript_text, transcript_item_is_generated = get_transcript(subsng)
 
+            if transcript_text is None:
+                continue
+
             if transcript_item_is_generated:
                 get_punctuated_text(transcript_text)
             else: