Fix SetImmutabilityPolicyOptions.format() NPE (Azure#21593)

* Fix SetImmutabilityPolicyOptions.format() NPE

* Fixed null pointer exception when SetImmutabilityPolicyOptions is nil

---------

Co-authored-by: Tanya Sethi <tanyasethi@microsoft.com>

Author: KastenMike

sdk/storage/azblob/CHANGELOG.md

@@ -7,6 +7,7 @@
 ### Breaking Changes
 
 ### Bugs Fixed
+* Fixed null pointer exception when `SetImmutabilityPolicyOptions` is passed as `nil`.
 
 ### Other Changes
 

sdk/storage/azblob/assets.json

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "go",
   "TagPrefix": "go/storage/azblob",
-  "Tag": "go/storage/azblob_2d881a137f"
+  "Tag": "go/storage/azblob_818d8addd0"
 }

sdk/storage/azblob/blob/client_test.go

@@ -3522,6 +3522,10 @@ func (s *BlobRecordedTestsSuite) TestSetImmutabilityPolicy() {
 	_, err = bbClient.SetImmutabilityPolicy(context.Background(), currentTime, setImmutabilityPolicyOptions)
 	_require.NoError(err)
 
+	resp, err := bbClient.SetImmutabilityPolicy(context.Background(), currentTime, nil)
+	_require.NoError(err)
+	_require.Equal((*resp.ImmutabilityPolicyExpiry).UTC(), currentTime.UTC())
+
 	_, err = bbClient.SetLegalHold(context.Background(), false, nil)
 	_require.NoError(err)
 

sdk/storage/azblob/blob/models.go

@@ -458,7 +458,7 @@ type SetImmutabilityPolicyOptions struct {
 
 func (o *SetImmutabilityPolicyOptions) format() (*generated.BlobClientSetImmutabilityPolicyOptions, *ModifiedAccessConditions) {
 	if o == nil {
-		return nil, nil
+		return &generated.BlobClientSetImmutabilityPolicyOptions{}, nil
 	}
 	ac := &exported.BlobAccessConditions{
 		ModifiedAccessConditions: o.ModifiedAccessConditions,

sdk/storage/azblob/internal/testcommon/clients_auth.go

@@ -218,7 +218,6 @@ func CreateNewContainer(ctx context.Context, _require *require.Assertions, conta
 
 	_, err := containerClient.Create(ctx, nil)
 	_require.NoError(err)
-	// _require.Equal(cResp.RawResponse.StatusCode, 201)
 	return containerClient
 }