fix null ref on http conflict response in remote client

[kevxms]

This fixes a bug where a conflict response having null content causes null reference exception but should throw OrchestrationAlreadyExistsException

DurableTask.AzureServiceFabric.Exceptions.RemoteServiceException: CreateTaskOrchestrationAsync failed with status code InternalServerError: {"$type":"System.NullReferenceException, mscorlib","ClassName":"System.NullReferenceException","Message":"Object reference not set to an instance of an object.","Data":{"$type":"System.Collections.ListDictionaryInternal, mscorlib","MS_LoggedBy":{"$type":"System.Collections.Generic.List`1[[System.Object, mscorlib]], mscorlib","$values":[{"$type":"DurableTask.AzureServiceFabric.Service.ProxyServiceExceptionLogger, DurableTask.AzureServiceFabric"}]}},"InnerException":null,"HelpURL":null,"StackTraceString":"
   at DurableTask.AzureServiceFabric.Service.FabricOrchestrationServiceController.<CreateTaskOrchestration>d__2.MoveNext() in /_/src/DurableTask.AzureServiceFabric/Service/FabricOrchestrationServiceController.cs:line 53\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
   at System.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__1`1.MoveNext()\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n
   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
   at DurableTask.AzureServiceFabric.Service.ActivityLoggingMessageHandler.<SendAsync>d__0.MoveNext() in /_/src/DurableTask.AzureServiceFabric/Service/ActivityLoggingMessageHandler.cs:line 35","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8\nMoveNext\nDurableTask.AzureServiceFabric, Version=2.3.11.0, Culture=neutral, PublicKeyToken=d53979610a6e89dd\nDurableTask.AzureServiceFabric.Service.FabricOrchestrationServiceController+<CreateTaskOrchestration>d__2\nVoid MoveNext()","HResult":-2147467261,"Source":"DurableTask.AzureServiceFabric","WatsonBuckets":null}
   at DurableTask.AzureServiceFabric.Remote.RemoteOrchestrationServiceClient.<PutJsonAsync>d__27.MoveNext() in /_/src/DurableTask.AzureServiceFabric/Remote/RemoteOrchestrationServiceClient.cs:line 320
   at DurableTask.AzureServiceFabric.Remote.RemoteOrchestrationServiceClient.<CreateTaskOrchestrationAsync>d__11.MoveNext() in /_/src/DurableTask.AzureServiceFabric/Remote/RemoteOrchestrationServiceClient.cs:line 102
   at DurableTask.Core.TaskHubClient.<InternalCreateOrchestrationInstanceWithRaisedEventAsync>d__27.MoveNext() in /_/src/DurableTask.Core/TaskHubClient.cs:line 624

[NeetArt]

Can you also bump up the version in the DurableTask.AzureServiceFabric.csproj file?