Don't fail in the face of a lacking attribute when wrapping a

function.

Lib/importlib/_bootstrap.py

@@ -170,6 +170,7 @@ def _write_atomic(path, data):
 def _wrap(new, old):
     """Simple substitute for functools.wraps."""
     for replace in ['__module__', '__name__', '__qualname__', '__doc__']:
+        if hasattr(old, replace):
             setattr(new, replace, getattr(old, replace))
     new.__dict__.update(old.__dict__)