fix(mp-alipay): 修复使用支付宝小程序组件（未使用事件）报错的问题

packages/uni-template-compiler/__tests__/compiler-mp-alipay.spec.js

@@ -45,6 +45,15 @@ describe('mp:compiler-mp-alipay', () => {
       '<component1 v-for="item in items" :ref="c4"></component1>',
       '<component1 vue-id="{{\'551070e6-1-\'+__i0__}}" ref="__r" data-ref-in-for="{{c4}}" a:for="{{items}}" a:for-item="item" a:for-index="__i0__" onVueInit="__l"></component1>'
     )
+    assertCodegen(
+      '<component1>text</component1>',
+      '<component1 vue-id="551070e6-1" data-com-type="wx" ref="__r" onVueInit="__l">text</component1>',
+      undefined,
+      undefined,
+      {
+        wxComponents: { component1: '/mycomponents/component1' }
+      }
+    )
     assertCodegen(
       '<component1 @change="onChange" @cancle="onCancle">text</component1>',
       '<component1 onChange="__e" onCancle="__e" vue-id="551070e6-1" data-event-opts="{{[[\'^change\',[[\'onChange\']]],[\'^cancle\',[[\'onCancle\']]]]}}" data-com-type="wx" ref="__r" data-event-list="onChange,onCancle" onVueInit="__l">text</component1>',

packages/uni-template-compiler/lib/script/traverse/data/index.js

@@ -58,20 +58,25 @@ module.exports = function traverseData (path, state, tagName) {
           t.stringLiteral('__r')
         )
       )
-      const properties = path.node.properties.find(prop => prop.key.name === 'on').value.properties
-      const list = []
-      for (let index = 0; index < properties.length; index++) {
-        const element = properties[index]
-        if (element.value.value === '__e') {
-          list.push(element.key.value)
+      const on = path.node.properties.find(prop => prop.key.name === 'on')
+      if (on) {
+        const properties = on.value.properties
+        const list = []
+        for (let index = 0; index < properties.length; index++) {
+          const element = properties[index]
+          if (element.value.value === '__e') {
+            list.push(element.key.value)
+          }
+        }
+        if (list.length) {
+          addAttrProperties.push(
+            t.objectProperty(
+              t.stringLiteral(ATTR_DATA_EVENT_LIST),
+              t.stringLiteral(list.join(','))
+            )
+          )
         }
       }
-      addAttrProperties.push(
-        t.objectProperty(
-          t.stringLiteral(ATTR_DATA_EVENT_LIST),
-          t.stringLiteral(list.join(','))
-        )
-      )
       if (wxComponent.startsWith('plugin://')) {
         const wrapperTag = 'plugin-wrapper'
         const orgPath = path.parentPath