fix(compiler-core): prevent generating invalid code for v-bind with empty expression (#1720)

packages/compiler-core/__tests__/transforms/vBind.spec.ts

@@ -83,7 +83,8 @@ describe('compiler: transform v-bind', () => {
 
   test('should error if no expression', () => {
     const onError = jest.fn()
-    parseWithVBind(`<div v-bind:arg />`, { onError })
+    const node = parseWithVBind(`<div v-bind:arg />`, { onError })
+    const props = (node.codegenNode as VNodeCall).props as ObjectExpression
     expect(onError.mock.calls[0][0]).toMatchObject({
       code: ErrorCodes.X_V_BIND_NO_EXPRESSION,
       loc: {
@@ -97,6 +98,16 @@ describe('compiler: transform v-bind', () => {
         }
       }
     })
+    expect(props.properties[0]).toMatchObject({
+      key: {
+        content: `arg`,
+        isStatic: true
+      },
+      value: {
+        content: ``,
+        isStatic: true
+      }
+    })
   })
 
   test('.camel modifier', () => {