azure.routeTables().getByResourceGroup throwing NLE for invalid route table. It should return null over exception.

On azure SDK 1.10.0 - when we try to fetch the route table with valid resource group and invalid route table name it is throwing NullPointerException.

RouteTable rt = azure.routeTables().getByResourceGroup("resournce-group-1", "RT-1");

Exception stack trace
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Exception in thread "main" java.lang.NullPointerException
at com.microsoft.azure.management.network.implementation.RouteTablesImpl.wrapModel(RouteTablesImpl.java:46)
at com.microsoft.azure.management.network.implementation.RouteTablesImpl.wrapModel(RouteTablesImpl.java:16)
at com.microsoft.azure.management.resources.fluentcore.arm.collection.implementation.GroupableResourcesImpl$1.call(GroupableResourcesImpl.java:117)
at com.microsoft.azure.management.resources.fluentcore.arm.collection.implementation.GroupableResourcesImpl$1.call(GroupableResourcesImpl.java:114)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:77)
at rx.internal.operators.OperatorMerge$MergeSubscriber.emitScalar(OperatorMerge.java:511)
at rx.internal.operators.OperatorMerge$MergeSubscriber.tryEmit(OperatorMerge.java:466)
at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:244)
at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:148)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:77)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:173)
at rx.Subscriber.setProducer(Subscriber.java:211)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
at rx.Observable.unsafeSubscribe(Observable.java:10142)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10142)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.Observable.unsafeSubscribe(Observable.java:10142)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.Observable.unsafeSubscribe(Observable.java:10142)
at rx.internal.operators.DeferredScalarSubscriber.subscribeTo(DeferredScalarSubscriber.java:153)
at rx.internal.operators.OnSubscribeTakeLastOne.call(OnSubscribeTakeLastOne.java:32)
at rx.internal.operators.OnSubscribeTakeLastOne.call(OnSubscribeTakeLastOne.java:22)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.subscribe(Observable.java:10238)
at rx.Observable.subscribe(Observable.java:10205)
at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:444)
at rx.observables.BlockingObservable.last(BlockingObservable.java:227)
at com.microsoft.azure.management.resources.fluentcore.arm.collection.implementation.GroupableResourcesImpl.getByResourceGroup(GroupableResourcesImpl.java:109)
at com.microsoft.azure.management.resources.fluentcore.arm.collection.implementation.GroupableResourcesImpl.getByResourceGroup(GroupableResourcesImpl.java:33)
at com.shantanu.testAzureApp.App.main(App.java:84)
Caused by: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: null
at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:118)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:73)
... 35 more
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Ideally it should return the null object if the route table is not available in the given resource group.
Also, method getByResourceGroup internally calls - method getByResourceGroupAsync which is asynchronous operation. Do we have any sync operation.

Start with RouteTablesImpl.java at wrapModel line 46, then trace GroupableResourcesImpl.getByResourceGroup and getByResourceGroupAsync. Reproduce the call with a valid resource group and invalid route table name; done means the lookup returns null without a NullPointerException and the synchronous behavior is clarified.

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