Update app.py

app.py

@@ -148,7 +148,14 @@ def parse(category, chatbot):
     """Takes the chatbot prompt and response and updates the extracted information"""
     global PARSING_REGEXP
 
-    answer = chatbot[0][1]
+    if chatbot:
+        if len(chatbot) > 0:
+            answer = chatbot[0][1]
+        else:
+            answer = ""
+    else:
+        answer = ""
+        
     category = Category[category]
     chain = categories.category_modules[category].chain
     yield {"status": "Parsing response..."}