From d736c5826557311bbc060746586d59e99b619ced Mon Sep 17 00:00:00 2001
From: Kanit Wongsuphasawat <kanit.w@databricks.com>
Date: Wed, 15 May 2024 13:58:45 -0700
Subject: [PATCH] fix: config test

---
 src/config.ts                           | 3 ++-
 test/compile/data/filterinvalid.test.ts | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/config.ts b/src/config.ts
index d339d387a1..4956261e2c 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -602,9 +602,10 @@ export function initConfig(specifiedConfig: Config = {}): Config<SignalRef> {
 
   if (mergedConfig.scale) {
     const {invalid, ...otherScaleConfig} = mergedConfig.scale;
+    const newScaleInvalid = replaceExprRef(invalid, {level: 1});
     outputConfig.scale = {
       ...replaceExprRef(otherScaleConfig),
-      invalid: replaceExprRef(invalid, {level: 1})
+      ...(keys(newScaleInvalid).length > 0 ? {invalid: newScaleInvalid} : {})
     };
   }
 
diff --git a/test/compile/data/filterinvalid.test.ts b/test/compile/data/filterinvalid.test.ts
index f23412ef04..fe1b272a7d 100644
--- a/test/compile/data/filterinvalid.test.ts
+++ b/test/compile/data/filterinvalid.test.ts
@@ -47,11 +47,11 @@ describe('compile/data/filterinvalid', () => {
       });
     });
 
-    it('should add no null filter if when invalid is null', () => {
+    it('should add no null filter if when invalid is show', () => {
       const model = parseUnitModelWithScale(
         mergeDeep<TopLevel<NormalizedUnitSpec>>(spec, {
           config: {
-            mark: {invalid: null}
+            mark: {invalid: 'show'}
           }
         })
       );