API Explorer does not show "/users" endpoint API

Bug description

The AM API Explorer doesn't currently show the "/users" endpoint API. This is an expandable tree node (so, not a leaf node). When clicked, expands the tree to show sub-items (e.g. policies) but does not show the users API itself in the right-hand pane.

See also conversation in this PR.

How to reproduce the issue

1. Login to AM as amadmin
2. Open API explorer
3. Navigate to "/users" endpoint and select
4. You will see the node expand but the API is not presented in the right-hand pane.

Expected behaviour

"/users" API presented in right-hand pane

Current behaviour

Node expands but API is not presented.

Work around

None

Code analysis

None