ref(utils): Explicitly use None default when checking metadata

Fixes #4035

Author: mpurnell1

Diff for: sentry_sdk/utils.py

@@ -1665,7 +1665,7 @@ def _generate_installed_modules():
 
         yielded = set()
         for dist in metadata.distributions():
-            name = dist.metadata["Name"]
+            name = dist.metadata.get("Name", None)
             # `metadata` values may be `None`, see:
             # https://github.com/python/cpython/issues/91216
             # and

Diff for: tests/test_utils.py

@@ -650,12 +650,12 @@ def test_installed_modules():
 
     if importlib_available:
         importlib_distributions = {
-            _normalize_distribution_name(dist.metadata["Name"]): version(
-                dist.metadata["Name"]
+            _normalize_distribution_name(dist.metadata.get("Name", None)): version(
+                dist.metadata.get("Name", None)
             )
             for dist in distributions()
-            if dist.metadata["Name"] is not None
-            and version(dist.metadata["Name"]) is not None
+            if dist.metadata.get("Name", None) is not None
+            and version(dist.metadata.get("Name", None)) is not None
         }
         assert installed_distributions == importlib_distributions