changes without context (#123)

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Co-authored-by: Anthonios Partheniou <partheniou@google.com>

compute/compute/snippets/noxfile.py

@@ -98,6 +98,10 @@ def get_pytest_env_vars() -> Dict[str, str]:
  "True",
  "true",
 )
+
+# Error if a python version is missing
+nox.options.error_on_missing_interpreters = True
+
 #
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