Removed empy helpers

NOTICE.md

@@ -129,13 +129,6 @@ convert_utf
     - Binary distributions for Windows
     - Binary distributions for Linux
 
-empy_helpers
-  - License: Apache 2.0
-  - Project: https://github.com/ros2/rosidl/blob/master/rosidl_adapter/rosidl_adapter/resource/__init__.py
-  - Copyright: 2018 Open Source Robotics Foundation, Inc.
-  - Included in:
-    - Copy in repository: `/doc/extensions/empy_helpers/__init__.py` (modified)
-
 Findqwt.cmake
   - License: Modified BSD 2-Clause
   - Project: https://gitlab.kitware.com/cmake/community/-/wikis/contrib/modules/FindQwt

doc/requirements.txt

@@ -4,7 +4,6 @@ sphinx-book-theme==1.1.2
 sphinx-tabs==3.4.5
 PyGithub
 autodoc
-empy==3.3.4           # The empy_helpers are incompatible with Empy 4.0. Also see this issue: https://github.com/ros2/rosidl/issues/779
 semantic-version 
 exhale
 Jinja2

doc/rst/license/thirdparty_licenses.rst

@@ -96,11 +96,6 @@ They are used by Eclipse eCAL, but not associated to it in any way.
        - |fa-windows| Binary distributions for Windows
        - |fa-ubuntu| Binary distributions for Linux
 
-   * - `empy_helpers <https://github.com/ros2/rosidl/blob/master/rosidl_adapter/rosidl_adapter/resource/__init__.py>`_
-     - :ref:`apache_2_0`
-     - 2018 Open Source Robotics Foundation, Inc.
-     - - |fa-file-alt| Copy in repository: :file:`/doc/extensions/empy_helpers/__init__.py` (modified)
-
    * - `Findqwt.cmake <https://gitlab.kitware.com/cmake/community/-/wikis/contrib/modules/FindQwt>`_
      - :ref:`findqwt-bsd-2`
      - Copyright 2010-2013, Julien Schueller