Trap AttributeError in exactly one place.

pkg_resources/__init__.py

@@ -2102,14 +2102,10 @@ def _handle_ns(packageName, path_item):
     try:
         loader = importer.find_spec(packageName).loader
     except AttributeError:
-        try:
         # capture warnings due to #1111
         with warnings.catch_warnings():
             warnings.simplefilter("ignore")
             loader = importer.find_module(packageName)
-        except AttributeError:
-            # not a system module
-            loader = None
 
     if loader is None:
         return None