Fix for #147

[fbradyirl]

data["organization"] is never initialised so it is not possible to use the be_geo_id or caller features.

Trying to set an attribute in the user agent, but I get a key error.

        self.teams = WebexTeamsAPI(access_token=access_token,
                                   be_geo_id= f"{str(uuid.uuid4())}".upper())

  File "/Users/fibrady/projects/core/venv/lib/python3.9/site-packages/webexteamssdk/api/__init__.py", line 182, in __init__
    self._session = RestSession(
  File "/Users/fibrady/projects/core/venv/lib/python3.9/site-packages/webexteamssdk/restsession.py", line 230, in __init__
    "User-Agent": user_agent(be_geo_id=be_geo_id, caller=caller),
  File "/Users/fibrady/projects/core/venv/lib/python3.9/site-packages/webexteamssdk/restsession.py", line 155, in user_agent
    data["organization"]["be_geo_id"] = be_geo_id
KeyError: 'organization'