Add handling of TypeError case to is_native (plasma-umass#588)

This should address plasma-umass#587 which has more information, but basically the check for native fails on at least my system because package.__file__ exists, but is None, so os.path.dirname() returns a TypeError.

scalene/scalene_analysis.py

@@ -31,6 +31,9 @@ def is_native(package_name: str) -> bool:
         except AttributeError:
             # No __file__, meaning it's built-in. Let's call it native.
             result = True
+        except TypeError:
+            # __file__ is there, but empty (os.path.dirname() returns TypeError).  Let's call it native.
+            result = True
         except ModuleNotFoundError:
             # This module is not installed; fail gracefully.
             result = False