Fixed bug with python tests/fixtures.py

https://github.com/simonw/datasette/runs/1333357885?check_suite_focus=true

datasette/views/base.py

@@ -8,6 +8,7 @@ import urllib
 import pint
 
 from datasette import __version__
+from datasette.plugins import pm
 from datasette.database import QueryInterrupted
 from datasette.utils import (
     await_me_maybe,