Adjust logging so NATS connection closure only logs error if the error is defined.

src/nats.ts

@@ -41,7 +41,11 @@ class NatsManager {
 
             // Handle connection close events
             this.nc.closed().then((err) => {
+                if (err) {
                     log("ERROR", `NATS: Connection closed: ${err}`);
+                } else {
+                    log("INFO", "NATS: Connection ended")
+                }
                 this.nc = null;
                 this.js = null;
                 this.kv = null;