java.lang.NullPointerException in GrpcExceptionHandlerSpec

```
[ERROR] [10/12/2023 15:08:18.179] [pool-9-thread-9-ScalaTest-running-GrpcExceptionHandlerSpec] [org.apache.pekko.grpc.scaladsl.GrpcExceptionHandler(pekko://Test)] Unhandled error: [null]rpcClientSettingsSpec 0s
java.lang.NullPointerException
at org.apache.pekko.grpc.scaladsl.GrpcExceptionHandlerSpec.(GrpcExceptionHandlerSpec.scala:53)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:454)
at sbt.TestRunner.runTest$1(TestFramework.scala:153)
at sbt.TestRunner.run(TestFramework.scala:168)
at sbt.TestFramework$$anon$3$$anonfun$$lessinit$greater$1.$anonfun$apply$1(TestFramework.scala:336)
at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:296)
at sbt.TestFramework$$anon$3$$anonfun$$lessinit$greater$1.apply(TestFramework.scala:336)
at sbt.TestFramework$$anon$3$$anonfun$$lessinit$greater$1.apply(TestFramework.scala:336)
at sbt.TestFunction.apply(TestFramework.scala:348)
at sbt.Tests$.$anonfun$toTask$1(Tests.scala:436)
at sbt.std.Transform$$anon$3.$anonfun$apply$2(Transform.scala:47)
at sbt.std.Transform$$anon$4.work(Transform.scala:69)
at sbt.Execute.$anonfun$submit$2(Execute.scala:283)
at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
at sbt.Execute.work(Execute.scala:292)
at sbt.Execute.$anonfun$submit$1(Execute.scala:283)
at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:65)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)

```

Start by running GrpcExceptionHandlerSpec and inspect its constructor at GrpcExceptionHandlerSpec.scala:53, where the stack trace reports the failure. Trace the null value through the test setup and GrpcExceptionHandler, then add or update coverage so the test completes without the reported NullPointerException.

Written by the indexing model from the issue text.