Update app.py

app.py

@@ -42,8 +42,9 @@ def whatsapp_webhook():
 
        
         
-            
-            response_text = predict_disease(filepath)
+            if filepath:
+                
+                response_text = predict_disease(filepath)
             else:
                 response_text = "Please specify if you want to detect a pest or a disease."