fix exception not being passed through future

platforms/bungeecord/src/main/java/us/ajg0702/queue/platforms/bungeecord/server/BungeeServer.java

@@ -37,8 +37,10 @@ public class BungeeServer implements AdaptedServer {
         CompletableFuture<AdaptedServerPing> future = new CompletableFuture<>();
         handle.ping((pp, error) -> {
             if(error != null) {
-                future.complete(null);
+                future.completeExceptionally(error);
+                return;
             }
+
             future.complete(new BungeeServerPing(pp));
         });
         return future;

platforms/velocity/src/main/java/us/ajg0702/queue/platforms/velocity/server/VelocityServer.java

@@ -36,11 +36,12 @@ public class VelocityServer implements AdaptedServer {
         CompletableFuture<AdaptedServerPing> future = new CompletableFuture<>();
         CompletableFuture<ServerPing> serverPing = handle.ping();
         serverPing.thenRunAsync(() -> {
-            AdaptedServerPing aPing = null;
+            AdaptedServerPing aPing;
             try {
                 aPing = new VelocityServerPing(serverPing.get());
-            } catch (InterruptedException | ExecutionException e) {
+            } catch (Throwable e) {
-                e.printStackTrace();
+                future.completeExceptionally(e);
+                return;
             }
             future.complete(aPing);
         });