Microsoft.ServiceFabric.Data.ReliableStateManager throws NullReferenceException on Linux when there is no /etc/servicefabric directory

[OlegKarasik]

Microsoft.ServiceFabric.Data.ReliableStateManager throws NullReferenceException on Linux when there is no /etc/servicefabric directory (this usually happens if you have installed the servicefabricsdkcommon but didn't created a cluster - I had this use case when running application unit-tests that create instance of StatefulService class).

The exception is happening when reading value from configuration store (that doesn't exist).

NativeConfigStore.FabricGetConfigStore()
  .ReadUnencryptedString("NativeRunConfiguration", "EnableNativeReliableStateManager");

StackTrace:

Error Message:
 System.NullReferenceException : Object reference not set to an instance of an object.
Stack Trace:
   at System.Fabric.Interop.NativeTypes.FromNativeString(IFabricStringResult result)
   at System.Fabric.Interop.Utility.WrapNativeSyncInvoke[TResult](Func`1 func, String functionTag, String functionArgs)
   at Microsoft.ServiceFabric.Data.ReliableStateManager..ctor(StatefulServiceContext serviceContext, ReliableStateManagerConfiguration configuration)
   at Microsoft.ServiceFabric.Services.Runtime.StatefulService..ctor(StatefulServiceContext serviceContext)