Error when get a non-persist topic info which is not initialized with jwt token

```
--- An unexpected error occurred in the server ---

Message: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: java.lang.NullPointerException

Stacktrace:

org.apache.pulsar.broker.PulsarServerException: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: java.lang.NullPointerException
at org.apache.pulsar.broker.PulsarService.getAdminClient(PulsarService.java:1427)
at org.apache.pulsar.broker.admin.v2.NonPersistentTopics.getList(NonPersistentTopics.java:408)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$VoidOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:159)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:475)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:397)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:255)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:234)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680)
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:366)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:319)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1631)
at org.apache.pulsar.broker.web.ResponseHandlerFilter.doFilter(ResponseHandlerFilter.java:67)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
at org.apache.pulsar.broker.web.AuthenticationFilter.doFilter(AuthenticationFilter.java:81)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:179)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:516)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:400)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:645)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:392)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: java.lang.NullPointerException
at org.apache.pulsar.client.api.AuthenticationFactory.create(AuthenticationFactory.java:92)
at org.apache.pulsar.client.admin.internal.PulsarAdminBuilderImpl.authentication(PulsarAdminBuilderImpl.java:87)
at org.apache.pulsar.broker.PulsarService.getAdminClient(PulsarService.java:1404)
... 67 more
Caused by: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: java.lang.NullPointerException
at org.apache.pulsar.client.impl.AuthenticationUtil.create(AuthenticationUtil.java:84)
at org.apache.pulsar.client.impl.PulsarClientImplementationBindingImpl.createAuthentication(PulsarClientImplementationBindingImpl.java:127)
at org.apache.pulsar.client.api.AuthenticationFactory.create(AuthenticationFactory.java:90)
... 69 more
Caused by: java.lang.NullPointerException
at org.apache.pulsar.client.impl.auth.AuthenticationToken.configure(AuthenticationToken.java:86)
at org.apache.pulsar.client.impl.AuthenticationUtil.create(AuthenticationUtil.java:74)
... 71 more
```

**To Reproduce**
1. set up a pulsar(v2.10.0) cluster with jwt key pair
2. `curl -v http://localhost:8080/admin/v2/non-persistent/test-tenant/ns1 -H "Accept: application/json" -H "Authorization: Bearer [token]" -H "user-agent: Pulsar-test-v2.7.0"`, which the pulsar-manager v0.3.0 dose
3. get the java back trace response

Reproduce the curl request against the v2.10.0 cluster, then trace NonPersistentTopics.java through PulsarService.java and AuthenticationToken.java using the stack trace as the entry point. Determine why the JWT-backed admin client reaches the null-pointer path; done means the non-persistent topic-info request no longer fails with UnsupportedAuthenticationException and returns its expected response.

Written by the indexing model from the issue text.