Email Notification Perform Test GIves an Error Code 500

[AkshayAshirvad-Affinsys]

• I have configured the Email Under the Admininstration -> Configuration -> Email. And the Configuration Test was sucessful I recieved the mail.
• When I Trying the Alert with the following configuration to Send an Email Alert when a PROJECT is created but throws an 500 error

• Logs
  025-01-09 09:49:12,874 ERROR [GlobalExceptionHandler] Uncaught internal server error [requestId=1f7a4f15-3378-44ae-92b6-9549d6262b0b]
  java.lang.NullPointerException: Cannot invoke "String.length()" because "" is null
  at java.base/java.io.StringReader.(Unknown Source)
  at org.dependencytrack.resources.v1.NotificationPublisherResource.testSlackPublisherConfig(NotificationPublisherResource.java:352)
  at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.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$1.run(AbstractJavaResourceMethodDispatcher.java:146)
  at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:189)
  at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:176)
  at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:93)
  at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:478)
  at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:400)
  at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81)
  at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:274)
  at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
  at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
  at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
  at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
  at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
  at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:266)
  at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:253)
  at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:696)
  at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:397)
  at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:349)
  at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:358)
  at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:312)
  at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
  at org.eclipse.jetty.ee10.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1379)
  at org.eclipse.jetty.ee10.servlet.ServletHolder.handle(ServletHolder.java:736)
  at org.eclipse.jetty.ee10.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1614)
  at alpine.server.filters.ContentSecurityPolicyFilter.doFilter(ContentSecurityPolicyFilter.java:225)
  at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
  at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1586)
  at alpine.server.filters.ClickjackingFilter.doFilter(ClickjackingFilter.java:93)
  at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
  at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1586)
  at alpine.server.filters.WhitelistUrlFilter.doFilter(WhitelistUrlFilter.java:166)
  at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:208)
  at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1586)
  at org.eclipse.jetty.ee10.servlet.ServletHandler$MappedServlet.handle(ServletHandler.java:1547)
  at org.eclipse.jetty.ee10.servlet.ServletChannel.dispatch(ServletChannel.java:819)
  at org.eclipse.jetty.ee10.servlet.ServletChannel.handle(ServletChannel.java:436)
  at org.eclipse.jetty.ee10.servlet.ServletHandler.handle(ServletHandler.java:464)
  at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:575)
  at org.eclipse.jetty.ee10.servlet.SessionHandler.handle(SessionHandler.java:717)
  at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1060)
  at org.eclipse.jetty.server.Server.handle(Server.java:182)
  at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:662)
  at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:418)
  at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322)
  at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)
  at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
  at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:478)
  at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:441)
  at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)
  at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201)
  at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:311)
  at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:979)
  at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1209)
  at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1164)
  at java.base/java.lang.Thread.run(Unknown Source)

• why do i see a Slack Channel ...The Alert was for Email right. I did not make any changes in the Templates.