Fix for _get_retry_request_callable so chunked uploads continu… (#485)

Author: sujaygarlanka

HISTORY.rst

@@ -3,9 +3,13 @@
 Release History
 ---------------
 
+Next Release
+++++++++
+- Fixed bug in `_get_retry_request_callable` introduced in release 2.7.0 which caused chunked uploads to fail
+
 2.7.0 (2020-01-16)
 ++++++++
-- Fixed bug in get_admin_events function which caused errors when the optional event_types parameter was omitted.
+- Fixed bug in `get_admin_events` function which caused errors when the optional `event_types` parameter was omitted.
 - Add marker based pagination for listing users.
 - Added support for more attribute parameters when uploading new files and new versions of existing files.
 - Combined preflight check and lookup of accelerator URL into a single request for uploads.

boxsdk/session/session.py

@@ -437,8 +437,11 @@ def _get_retry_request_callable(self, network_response, attempt_number, request,
         # pylint:disable=unused-argument
         data = kwargs.get('data', {})
         grant_type = None
-        if 'grant_type' in data:
-            grant_type = data['grant_type']
+        try:
+            if 'grant_type' in data:
+                grant_type = data['grant_type']
+        except TypeError:
+            pass
         code = network_response.status_code
         if (code in (202, 429) or code >= 500) and grant_type != self._JWT_GRANT_TYPE:
             return partial(