fix(defineModel): always default modifiers to empty object

close #9945

diff --git a/packages/runtime-core/src/apiSetupHelpers.ts b/packages/runtime-core/src/apiSetupHelpers.ts
index 244e30ac9a8fec2168be5087931db4b77e149788..dfa1635ad4f5799073908b4fc7954f109655f2f8 100644 (file)
--- a/packages/runtime-core/src/apiSetupHelpers.ts
+++ b/packages/runtime-core/src/apiSetupHelpers.ts
@@ -414,7 +414,7 @@ export function useModel(
     return {
       next() {
         if (i < 2) {
-          return { value: i++ ? props[modifierKey] : res, done: false }
+          return { value: i++ ? props[modifierKey] || {} : res, done: false }
         } else {
           return { done: true }
         }