TypeError

The view function did not return a valid response. The function either returned None or ended without a return statement.

        # the body must not be None

        if rv is None:

            raise TypeError(

                "The view function did not return a valid response. The"

                " function either returned None or ended without a return"

                " statement."

Solution

'return' was required to be added before calling the function!

def index():
    return qg.get_random_quote()