remediation and history entry for genconverter inheritance

HISTORY.rst

@@ -7,6 +7,8 @@ History
 * ``converter.unstructure`` now supports an optional parameter, `unstructure_as`, which can be used to unstructure something as a different type. Useful for unions.
 * Improve support for union un/structuring hooks. Flesh out docs for advanced union handling.
   (`#115 <https://github.com/Tinche/cattrs/pull/115>`_)
+* Fix `GenConverter` behavior with inheritance hierarchies of `attrs` classes.
+  (`#117 <https://github.com/Tinche/cattrs/pull/117>`_) (`#116 <https://github.com/Tinche/cattrs/issues/116>`_)
 
 1.1.2 (2020-11-29)
 ------------------

src/cattr/multistrategy_dispatch.py

@@ -32,7 +32,7 @@ class MultiStrategyDispatch(object):
     )
 
     def __init__(self, fallback_func):
-        self._direct_dispatch = dict()
+        self._direct_dispatch = {}
         self._function_dispatch = FunctionDispatch()
         self._function_dispatch.register(lambda _: True, fallback_func)
         self._single_dispatch = singledispatch(_DispatchNotFound)
@@ -41,7 +41,7 @@ def __init__(self, fallback_func):
     def _dispatch(self, cl):
         try:
             direct_dispatch = self._direct_dispatch.get(cl)
-            if direct_dispatch:
+            if direct_dispatch is not None:
                 return direct_dispatch
             dispatch = self._single_dispatch.dispatch(cl)
             if dispatch is not _DispatchNotFound: