Merge pull request #64 from AzureAD/scopes-are-required-in-username-password-flow

Change an optional scopes parameter to be required

Author: rayluo

msal/application.py

@@ -512,7 +512,7 @@ def acquire_token_by_device_flow(self, flow, **kwargs):
                 **kwargs)
 
     def acquire_token_by_username_password(
-            self, username, password, scopes=None, **kwargs):
+            self, username, password, scopes, **kwargs):
         """Gets a token for a given resource via user credentails.
 
         See this page for constraints of Username Password Flow.