Crowd updateApplication REST API endpoint does not work as expected

Issue Summary

Updating a Crowd application through the /rest/appmanagement/1/application/{applicationId} endpoint fails with an error code of 500 and a NullPointerException.

This is reproducible on Data Center: yes

Steps to Reproduce

1. Step 1: Spin-up Crowd and create a sample application in the UI.
2. Step 2: Obtain an XML or JSON form of an application by making a GET request to /rest/appmanagement/1/application/{applicationId} where applicationId is the ID of the application
3. Step 3: Make a PUT request to /rest/appmanagement/1/application/{applicationId} endpoint using the payload obtained in step 2 as the body

Expected Results

The application is successfully updated.

Actual Results

The update fails with an error code of 500.

Workaround

Application configuration can be updated using the Crowd UI or the user authenticated /rest/admin/1.0/application/{applicationId} endpoint.