Throw an error when "Name" is empty when localizing a string

[morning4coffe-dev]

          Your could probably also introduce another optional property in the Markup Extension for formatting arguments...

https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.localization.istringlocalizer.item?view=dotnet-plat-ext-8.0#microsoft-extensions-localization-istringlocalizer-item(system-string-system-object())

Originally posted by @szv in #100 (comment)