don't redirect on json permission denied

cause that's just silly

Change-Id: I3629f1ed03edff903d555fc6636caae221e83cfe
Reviewed-on: https://gerrit.instructure.com/33832
QA-Review: August Thornton <august@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Rob Orton <rob@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>