Logger returns NameError in non-interactive mode for Python 2

[ellbosch]

pytest -s tests/test_noninteractive_mode shows the following warning:

Traceback (most recent call last):
  File "/Users/ellbosch/Repos/mssql-cli/mssqlcli/mssql_cli.py", line 196, in __del__
  File "/Users/ellbosch/Repos/mssql-cli/mssqlcli/sqltoolsclient.py", line 90, in shutdown
  File "/Users/ellbosch/Repos/mssql-cli/mssqlcli/jsonrpc/jsonrpcclient.py", line 184, in shutdown
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1378, in info
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1514, in _log
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1524, in handle
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1586, in callHandlers
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 894, in handle
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1126, in emit
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1116, in _open
NameError: name 'open' is not defined

Looks like the logger is referenced post-deconstruction.