Fix typing errors for --no-strict-optional

Author: vanous

conftest.py

@@ -48,7 +48,7 @@ def pymvr_module():
 
 def pytest_configure(config):
     plugin = config.pluginmanager.getplugin("mypy")
-    plugin.mypy_argv.append("--no-strict-optional")
+    # plugin.mypy_argv.append("--no-strict-optional")
 
 
 def pytest_addoption(parser):