Fixes invalid AuthenticateWithKey function behavior when key parameter is null. Error was found by PVS-Studio for C# Trial
Fixes invalid AuthenticateWithKey function behavior when key parameter is null. Error was found by PVS-Studio for C# Trial

halex2005/diadocsdk-csharp,asvyazin/diadocsdk-csharp,halex2005/diadocsdk-csharp,diadoc/diadocsdk-csharp,ichaynikov/diadocsdk-csharp,ichaynikov/diadocsdk-csharp,asvyazin/diadocsdk-csharp,basmus/diadocsdk-csharp,basmus/diadocsdk-csharp,s-rogonov/diadocsdk-csharp,s-rogonov/diadocsdk-csharp,diadoc/diadocsdk-csharp