*Abort if no available relays to process

src/index.ts

@@ -118,6 +118,9 @@ export default class DHT {
     private async fillConnections(): Promise<any> {
         let available = [...this._relays.keys()].filter(x => [...this._activeRelays.keys()].includes(x));
         let relayPromises = [];
+        if (0 > available.length) {
+            return;
+        }
         while (this._activeRelays.size <= Math.min(this._maxConnections, available.length + this._activeRelays.size)) {
             const relayIndex = await randomNumber(0, available.length - 1);