7.7.1 StubSessionMixin

##
7.7.1 StubSessionMixin

The `StubSessionMixin` class ignores all session operations.

`add_session_vars`( | ...)

  Does nothing.

`del_session_vars`( | ...)

  Does nothing.

`encode_session`( | )

  Does nothing.

`load_session`( | )

  Does nothing.

`save_session`( | )

  Does nothing.

`remove_session`( | )

  Does nothing.

`set_save_session`( | flag)

  Does nothing.

`should_save_session`( | )

  Returns `0`.