fix(angular): do not default to empty arrays for @angular/build builders

Author: leosvelperez

packages/nx/src/adapter/ngcli-adapter.ts

@@ -100,7 +100,12 @@ export async function createBuilderContext(
   );
 
   const registry = new schema.CoreSchemaRegistry();
-  registry.addPostTransform(schema.transforms.addUndefinedDefaults);
+  const isAngularBuild = builderInfo.builderName?.startsWith('@angular/build:');
+  if (isAngularBuild) {
+    registry.addPostTransform(schema.transforms.addUndefinedObjectDefaults);
+  } else {
+    registry.addPostTransform(schema.transforms.addUndefinedDefaults);
+  }
   registry.addSmartDefaultProvider('unparsed', () => {
     // This happens when context.scheduleTarget is used to run a target using nx:run-commands
     return [];