If no key, return JSON blob unchanged

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 7.20.7 (unreleased)
 ### Implementation changes and bug fixes
 - [PR #1309](https://github.com/rqlite/rqlite/pull/1309): Factor Snapshot creation into own module.
+- [PR #1311](https://github.com/rqlite/rqlite/pull/1311): Support 'key' param on /status endpoint.
 
 ## 7.20.6 (June 16th 2023)
 ### Implementation changes and bug fixes

http/service.go

@@ -1991,8 +1991,11 @@ func keyParam(req *http.Request) string {
 }
 
 func getSubJSON(jsonBlob []byte, keyString string) (json.RawMessage, error) {
-	keys := strings.Split(keyString, ".")
+	if keyString == "" {
+		return jsonBlob, nil
+	}
 
+	keys := strings.Split(keyString, ".")
 	var obj interface{}
 	if err := json.Unmarshal(jsonBlob, &obj); err != nil {
 		return nil, fmt.Errorf("failed to unmarshal json: %w", err)