[8.11](backport #37092) x-pack/filebeat/input/entityanalytics/provide…

…r/okta/internal/okta: handle empty responses gracefully (#37099)

* x-pack/filebeat/input/entityanalytics/provider/okta/internal/okta: handle empty responses gracefully (#37092)

(cherry picked from commit 9b932c4)

* remove irrelevant changelog lines

---------

Co-authored-by: Dan Kortschak <90160302+efd6@users.noreply.github.com>

CHANGELOG.next.asciidoc

@@ -69,6 +69,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Fix panic when sqs input metrics getter is invoked {pull}36101[36101] {issue}36077[36077]
 - Fix handling of Juniper SRX structured data when there is no leading junos element. {issue}36270[36270] {pull}36308[36308]
 - Fix Filebeat Cisco module with missing escape character {issue}36325[36325] {pull}36326[36326]
+- Do not error when Okta API returns no data. {pull}37092[37092]
 
 *Heartbeat*
 

x-pack/filebeat/input/entityanalytics/provider/okta/internal/okta/okta.go

@@ -317,8 +317,8 @@ func getDetails[E entity](ctx context.Context, cli *http.Client, u *url.URL, key
 	}
 
 	var body bytes.Buffer
-	_, err = io.Copy(&body, resp.Body)
-	if err != nil {
+	n, err := io.Copy(&body, resp.Body)
+	if n == 0 || err != nil {
 		return nil, nil, err
 	}