DCOS-48704: Permissions builder exception

[GeorgiSTodorov]

Prevent the find function from returning undefined in order to fix a dcos-ui bug.

Closes https://jira.mesosphere.com/browse/DCOS-48704

Testing

1. In dcos-ui in dcos-ui/node_modules/reactjs-components/lib/Util/Util.js in the find function change return result; to return result || {}; on line 472.
2. Run npm start and open the localhost.
3. Open Organization > Users.
4. Create a new user and open it.
5. Open the permissions builder modal.
6. Click around and verify that the modal doesn't crash.
   Here are some cases that broke it before:

• From Services -> Marathon -> Operator > Leadership to Services -> Marathon -> Operator > Events.
• From Admin Router > Services > Metronome (Jobs) to Secrets Store.
• From Mesos > Master > Framework > Role to Mesos > Master > Framework > Service Account and vice versa.
• From Mesos > Master > Quota to Mesos > Master > Executor.

Trade-offs

None.

Dependencies

After merging this, we will also have to update the reactjs-components version in dcos-ui.

Screenshots

Before

After

[mesosphere-frontend-ci]

🎉 This PR is included in version 5.0.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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