Added an extra check

Author: TomNaessens

oauth2_provider/views/base.py

@@ -105,7 +105,7 @@ def get(self, request, *args, **kwargs):
             scopes, credentials = self.validate_authorization_request(request)
 
             # If the callback URI does not require authorization; immediately return a response
-            if request.GET['redirect_uri'] in oauth2_settings.uris_without_auth:
+            if 'redirect_uri' in request.GET and request.GET['redirect_uri'] in oauth2_settings.uris_without_auth:
                 uri, headers, body, status = self.create_authorization_response(
                         request=self.request, scopes=" ".join(scopes),
                         credentials=credentials, allow=True)