!4720 getAbilityLabel接口callback形式，调用成功第一个参数为null 3.1

Merge pull request !4720 from 耿文广/OpenHarmony-3.1-Release

appexecfwk/bundle_standard/bundlemanager/actsbundlemanageretstest/entry/src/main/ets/MainAbility/test/GetAbilityLabelJsUnit.test.ets

@@ -41,7 +41,7 @@ export default function getAbilityLabelJsUnit() {
                 expect(error).assertFail();
             });
             Bundle.getAbilityLabel(BUNDLE_NAME, ABILITY_NAME, (error, data) => {
-                expect(error).assertEqual(undefined);
+                expect(error).assertNull();
                 expect(data).assertEqual("entry_MainAbility");
                 done();
             });
@@ -66,7 +66,7 @@ export default function getAbilityLabelJsUnit() {
                 let timeNewStamp = Utils.getNowTime();
                 Utils.getDurationTime('[context_getAbilityLabel_test_0200]', timeOldStamp, timeNewStamp);
                 expect(data).assertEqual("bmsfirstright");
-                expect(error).assertEqual(undefined);
+                expect(error).assertNull();
                 done();
             });
         });