Remove except block only needed for Python 3.7

Author: jacobtylerwalls

astroid/interpreter/_import/util.py

@@ -78,12 +78,8 @@ def is_namespace(modname: str) -> bool:
 
             # Repair last_submodule_search_locations
             if last_submodule_search_locations:
-                # TODO: py38: remove except
-                try:
-                    # pylint: disable=unsubscriptable-object
-                    last_item = last_submodule_search_locations[-1]
-                except TypeError:
-                    last_item = last_submodule_search_locations._recalculate()[-1]
+                # pylint: disable=unsubscriptable-object
+                last_item = last_submodule_search_locations[-1]
                 # e.g. for failure example above, add 'a/b' and keep going
                 # so that find_spec('a.b.c', path=['a', 'a/b']) succeeds
                 assumed_location = pathlib.Path(last_item) / component