Fix error when running Get-AzCosmosDBSqlDatabase -Detailed on a database without shared throughput/container dedicated throughput

[plzm]

Reference: https://github.com/Azure/azure-powershell/blob/master/src/CosmosDB/CosmosDB/SQL/GetAzCosmosDBSqlDatabase.cs#L66

When Get-AzCosmosDBSqlDatabase is run with -Detailed against a database without shared throughput - i.e. containers have dedicated throughput - this cmdlet emits an error "Entity with the specified id does not exist in the system. ActivityId: [GUID], Microsoft.Azure.Documents.Common/2.10.0

Recommend adding null checks to the above-referenced code area for throughputSettingsGetResults to prevent this error.

[MehaKaushik]

Wrongly linked with PR

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @kushagraThapar, @srinathnarayanan, @southpolesteve, @shurd, @ealsur, @j82w, @anfeldma-ms.

[MehaKaushik]

-Detailed parameter is going to be deprecated in future releases, following which throughput would be available in the resource's respective GetResults object.