[Synapse][Spark] - Fix null reference exception due to some nullable properties (Azure#17112)

Co-authored-by: Dongwei Wang <dongwwa@microsoft.com>

Author: idear1203

sdk/synapse/Azure.Analytics.Synapse.Spark/CHANGELOG.md

@@ -1,7 +1,7 @@
 # Release History
 
 ## 1.0.0-beta.1 (Unreleased)
-
+- This release contains bug fixes to improve quality.
 
 ## 1.0.0-preview.2 (2020-09-01)
 - This release contains bug fixes to improve quality.

sdk/synapse/Azure.Analytics.Synapse.Spark/src/Generated/Models/SparkBatchJobState.Serialization.cs

@@ -6,25 +6,11 @@ Run `dotnet build /t:GenerateCode` to generate code.
 > see https://aka.ms/autorest
 
 ```yaml
-repo: https://github.com/Azure/azure-rest-api-specs/blob/fdf4bbfd7a73b28960d3a62490440345d6f2e8e3
+repo: https://github.com/Azure/azure-rest-api-specs/blob/a213469a74fff7aba237849bde2de7dffbdf970f
 ```
 
 ``` yaml
 public-clients: true
 input-file:
     - $(repo)/specification/synapse/data-plane/Microsoft.Synapse/preview/2019-11-01-preview/sparkJob.json
-```
-
-## Swagger workarounds
-
-### Add nullable annotations
-
-``` yaml
-directive:
-  from: swagger-document
-  where: $.definitions.SparkBatchJob
-  transform: >
-    $.properties.appId["x-nullable"] = true;
-    $.properties.appInfo["x-nullable"] = true;
-    $.properties.log["x-nullable"] = true;
-````
+```