Make ContainerRunner.run handle script_args=None correctly

[pont-us]

Fixes #77

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.32%. Comparing base (93f4326) to head (73ec265).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #78   +/-   ##
=======================================
  Coverage   85.32%   85.32%           
=======================================
  Files           6        6           
  Lines         586      586           
  Branches       66       66           
=======================================
  Hits          500      500           
  Misses         80       80           
  Partials        6        6           

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