Remove unnecessary placeholder variables

Author: samwelkanda

msgraph/core/_graph_client.py

@@ -41,8 +41,7 @@ def wrapper(*args, **kwargs):
         if 'headers' in kwargs.keys():
             kwargs['headers'].update({'middleware_control': json.dumps(middleware_control)})
         else:
-            kwargs['headers'] = dict()
-            kwargs['headers'].update({'middleware_control': json.dumps(middleware_control)})
+            kwargs['headers'] = {'middleware_control': json.dumps(middleware_control)}
 
         return func(*args, **kwargs)
 

msgraph/core/middleware/middleware.py

@@ -38,8 +38,7 @@ def send(self, request, **kwargs):
         else:
             middleware_control = dict()
 
-        headers = request.headers
-        request.context = RequestContext(middleware_control, headers)
+        request.context = RequestContext(middleware_control, request.headers)
 
         if self._middleware_present():
             return self._first_middleware.send(request, **kwargs)