Issue of Trac 1.2.2 "about" link

[johnt888@…]

Hi -

Received the following error message when I clicked the upper right "about" link:

2017-08-30 10:42:54,812 Trac[main] ERROR: [xx.xx.xx.xx] Internal Server Error: <RequestWithSession "GET '/about'">, referrer 'https://xxxx.com:8088/trac/test_upgrade/admin'
Traceback (most recent call last):
  File "trac/1.2.2/venv/lib/python2.7/site-packages/Trac-1.2.2-py2.7.egg/trac/web/main.py", line 623, in _dispatch_request
    dispatcher.dispatch(req)
  File "trac/1.2.2/venv/lib/python2.7/site-packages/Trac-1.2.2-py2.7.egg/trac/web/main.py", line 239, in dispatch
    resp = chosen_handler.process_request(req)
  File "trac/1.2.2/venv/lib/python2.7/site-packages/Trac-1.2.2-py2.7.egg/trac/about.py", line 66, in process_request
    data['systeminfo'] = self.env.get_systeminfo()
  File "trac/1.2.2/venv/lib/python2.7/site-packages/Trac-1.2.2-py2.7.egg/trac/env.py", line 332, in get_systeminfo
    info.extend(provider.get_system_info() or [])
  File "trac/1.2.2/venv/lib/python2.7/site-packages/Trac-1.2.2-py2.7.egg/trac/mimeview/txtl.py", line 89, in get_system_info
    version = get_pkginfo(textile).get('version', textile.__version__)
AttributeError: 'module' object has no attribute '__version__'