fix: refactor background heal for cluster health (#10225)

cmd/peer-rest-server.go

@@ -976,7 +976,11 @@ func (s *peerRESTServer) BackgroundHealStatusHandler(w http.ResponseWriter, r *h
 
 	ctx := newContext(r, w, "BackgroundHealStatus")
 
-	state := getLocalBackgroundHealStatus()
+	state, ok := getLocalBackgroundHealStatus()
+	if !ok {
+		s.writeErrorResponse(w, errServerNotInitialized)
+		return
+	}
 
 	defer w.(http.Flusher).Flush()
 	logger.LogIf(ctx, gob.NewEncoder(w).Encode(state))