Fix none type

app.py

@@ -403,7 +403,7 @@ else:
 def is_symtoms_intext_ai(text_input:str)->str: #used instead of: analyze_symptoms_from_text_ai()
     """Gives Symptoms or "" if no symptoms """
     response_text=analyze_symptoms_from_text_ai(text_input)
-    if len(response_text)>2:
+    if response_text and len(response_text)>2:
         if "error" not in response_text.lower():
             return response_text
     return ""