Need to check for null when creating Tags.

Author: athipp

src/ResourceManager/AnalysisServices/Commands.AnalysisServices/Models/AzureAnalysisServicesServer.cs

@@ -52,16 +52,16 @@ internal static AzureAnalysisServicesServer FromAnalysisServicesServer(AnalysisS
 
             return new AzureAnalysisServicesServer()
             {
-                AsAdministrators = server.AsAdministrators == null 
-                    ? new List<string>() 
+                AsAdministrators = server.AsAdministrators == null
+                    ? new List<string>()
                     : new List<string>(server.AsAdministrators.Members),
                 Location = server.Location,
                 Name = server.Name,
                 Type = server.Type,
                 ProvisioningState = server.ProvisioningState,
                 Id = server.Id,
-                Sku = ServerSku.FromResourceSku(server.Sku),
-                Tag = new Dictionary<string, string>(server.Tags)
+                Sku = server.Sku != null ? ServerSku.FromResourceSku(server.Sku) : new ServerSku(),
+                Tag = server.Tags != null ? new Dictionary<string, string>(server.Tags) : new Dictionary<string, string>()
             };
         }