fix bug?

app.py

@@ -59,15 +59,25 @@ def authenticate(new_username, new_pw):
 
 def get_user_transcripts(username):
     arr = []
-    if username is None: return [gr.update(value=arr)]
+    if username is None:
+        # User not logged in, return null transcript
+        return ['', '', '']
+    
+    # Check if the collection exists for the user
+    user_transcripts_ref = db.collection(f'Users/{username}/Transcripts')
+    if not user_transcripts_ref.get():  # Check if the collection exists
+        return arr  # Return empty array if the collection doesn't exist
+    
     # Fetch user's records
-    user_transcripts = db.collection(f'Users/{username}/Transcripts').stream()
+    user_transcripts = user_transcripts_ref.stream()
     for trans in user_transcripts:
         trans_dict = trans.to_dict()
         arr.append([trans_dict['date'], trans_dict['transcription'], trans_dict['sentiment_output']])
-    # populate empty table
-    if (len(arr) == 0): 
-        arr = ['', '', '']
+    
+    # If no transcripts found, return null transcript
+    if len(arr) == 0:
+        return ['', '', '']
+    
     return arr
 
 def get_user_score(username):