Fix empty nested serializers error

lib/typelizer/dsl.rb

@@ -64,7 +64,7 @@ def assign_type_information(attribute_name, attributes)
 
         unless respond_to?(attribute_name)
           define_singleton_method(attribute_name) do
-            result = instance_variable_get(instance_variable)
+            result = instance_variable_get(instance_variable) || {}
             if superclass.respond_to?(attribute_name)
               result.merge(superclass.send(attribute_name))
             else

spec/__snapshots__/AlbaUserEmptyNested.ts.snap

@@ -0,0 +1,14 @@
+// Typelizer digest 1002a651beda81fd3d91636e80542552
+//
+// DO NOT MODIFY: This file was automatically generated by Typelizer.
+import type {AlbaPost} from '@/types'
+
+type AlbaUserEmptyNested = {
+  id: number;
+  username: string | null;
+  posts?: Array<AlbaPost>;
+  avatar: unknown;
+  typed_avatar: string | null;
+}
+
+export default AlbaUserEmptyNested;

spec/__snapshots__/AmsUserEmptyNested.ts.snap

@@ -0,0 +1,14 @@
+// Typelizer digest 8c962041f6d8142284309a7a7695ccff
+//
+// DO NOT MODIFY: This file was automatically generated by Typelizer.
+import type {AmsPost} from '@/types'
+
+type AmsUserEmptyNested = {
+  id: number;
+  username: string | null;
+  avatar: unknown;
+  typed_avatar: string | null;
+  posts?: Array<AmsPost>;
+}
+
+export default AmsUserEmptyNested;

spec/__snapshots__/OjSerializersUserEmptyNested.ts.snap

@@ -0,0 +1,14 @@
+// Typelizer digest 792747cc9a6687f61568633186ee265d
+//
+// DO NOT MODIFY: This file was automatically generated by Typelizer.
+import type {OjSerializersPost} from '@/types'
+
+type OjSerializersUserEmptyNested = {
+  id: number;
+  username: string | null;
+  posts?: Array<OjSerializersPost>;
+  avatar: unknown;
+  typed_avatar: string | null;
+}
+
+export default OjSerializersUserEmptyNested;

spec/__snapshots__/index.ts.snap

@@ -1,4 +1,4 @@
-// Typelizer digest b30b67423d9475d4fb19db422c52a55f
+// Typelizer digest 22ff4b5bc8af67e16ccf03d2d3b8aad2
 //
 // DO NOT MODIFY: This file was automatically generated by Typelizer.
 export type { default as AlbaInline } from './AlbaInline'
@@ -7,17 +7,20 @@ export type { default as AlbaMeta } from './AlbaMeta'
 export type { default as AlbaPoro } from './AlbaPoro'
 export type { default as AlbaPost } from './AlbaPost'
 export type { default as AlbaUserAuthor } from './AlbaUserAuthor'
+export type { default as AlbaUserEmptyNested } from './AlbaUserEmptyNested'
 export type { default as AlbaUser } from './AlbaUser'
 export type { default as AlbaUserSerializerFoo } from './AlbaUserSerializerFoo'
 export type { AlbaVerbatimModuleSyntax } from './AlbaVerbatimModuleSyntax'
 export type { default as AmsPost } from './AmsPost'
 export type { default as AmsUserAuthor } from './AmsUserAuthor'
+export type { default as AmsUserEmptyNested } from './AmsUserEmptyNested'
 export type { default as AmsUser } from './AmsUser'
 export type { default as AmsUserSerializerFoo } from './AmsUserSerializerFoo'
 export type { AmsVerbatimModuleSyntax } from './AmsVerbatimModuleSyntax'
 export type { default as OjSerializersFlatUser } from './OjSerializersFlatUser'
 export type { default as OjSerializersPost } from './OjSerializersPost'
 export type { default as OjSerializersUserAuthor } from './OjSerializersUserAuthor'
+export type { default as OjSerializersUserEmptyNested } from './OjSerializersUserEmptyNested'
 export type { default as OjSerializersUser } from './OjSerializersUser'
 export type { default as OjSerializersUserSerializerFoo } from './OjSerializersUserSerializerFoo'
 export type { OjSerializersVerbatimModuleSyntax } from './OjSerializersVerbatimModuleSyntax'

spec/app/app/serializers/alba/user/empty_nested_serializer.rb

@@ -0,0 +1,6 @@
+module Alba
+  module User
+    class EmptyNestedSerializer < AuthorSerializer
+    end
+  end
+end

spec/app/app/serializers/ams/user/empty_nested_serializer.rb

@@ -0,0 +1,6 @@
+module Ams
+  module User
+    class EmptyNestedSerializer < AuthorSerializer
+    end
+  end
+end

spec/app/app/serializers/oj_serializers/user/empty_nested_serializer.rb

@@ -0,0 +1,6 @@
+module OjSerializers
+  module User
+    class EmptyNestedSerializer < AuthorSerializer
+    end
+  end
+end