Fix KeyError

✅ Solution

KeyError in fasthtml usually arises when accessing a dictionary (like request.args or request.form) with a key that doesn't exist. To fix this, use the `get()` method with a default value (e.g., `request.args.get('param_name', None)`) or check if the key exists using `if 'param_name' in request.args:` before accessing it directly with `request.args['param_name']`. This avoids the error and gracefully handles missing parameters.