Description of problem:
Listing of Report Templates per location/organization through the API mentioned at-

https://<satellite-fqdn>/apidoc/v2/report_templates/index.html

is not working, it returns below error-

The page you were looking for doesn't exist (404)


Version-Release number of selected component (if applicable):
Satellite 6.5.0
RHEL7.5

How reproducible:
Always

Steps to Reproduce:
1. Create a new Report Template, associate it to a specific Organization and Location
2. Using the assigned Location id, fire the below API request-
$ curl  -u admin:<pwd> -k -X GET   https://<sat-fqdn>/api/organization/10/report_templates  -H 'content-type: application/json' 
$ curl  -u admin:<pwd> -k -X GET   https://<sat-fqdn>/api/location/03/report_templates  -H 'content-type: application/json' 

Both requests, shows the error page with below title-
The page you were looking for doesn't exist (404)
3.

Actual results:
API for listing report template per location/organization returns 404 error

Expected results:
Should list the requested report.

Additional info:
1- Proper Organization and Location is assigned to the Report Template, e.g.-

$ curl -u admin:<pwd> -k -X GET   https://<sat-fqdn>/api/report_templates/154  -H 'content-type: application/json' | grep organization
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1295    0  1295    0     0  10489      0 --:--:-- --:--:-- --:--:-- 10528
{"template":"<%#\nname: Registered hosts\nsnippet: false\ntemplate_inputs:\n- name: Hosts filter\n  required: false\n  input_type: user\n  description: Limit the report only on hosts found by this search query. Keep empty\n    for report on all available hosts.\n  advanced: false\nmodel: ReportTemplate\nrequire:\n- plugin: katello\n version: 3.9.0\n-%>\n<%- load_hosts(search: input('Hosts filter'), includes: [:operatingsystem, :subscriptions, :kernel_release, :interfaces, :owner, :applicable_errata, :applicable_rpms]).each_record do |host| -%>\n<%-   report_row(\n        'Name': host.name,\n        'Ip': host.ip,\n        'Operating System': host.operatingsystem,\n        'Subscriptions': host_subscriptions(host),\n        'Applicable Errata': host_applicable_errata_ids(host),\n        'Owner': host.owner,\n        'Kernel': host_kernel_release(host),\n        'Latest kernel available': host_latest_applicable_rpm_version(host, 'kernel')\n      ) -%>\n<%- end -%>\n<%= report_render -%>\n","default":true,"created_at":"2019-02-25 10:08:59 UTC","updated_at":"2019-02-25 10:09:04 UTC","name":"Registered hosts clone","id":154,"locations":[{"id":3,"name":"Pune","title":"Pune","description":""}],"organizations":[{"id":10,"name":"RedHat","title":"RedHat","description":""}]}

2- webUI shows Report Template properly when selecting the specific Organization & Location.