fix(v3): ignore comment element (requestComponentInfo)

src/core/view/bridge/subscribe/api/request-component-info.js

@@ -84,14 +84,15 @@ function getNodeInfo (el, fields) {
 
 function getNodesInfo (pageVm, component, selector, single, fields) {
   const $el = findElm(component, pageVm)
+  if (!$el || ($el && $el.nodeType === 8)) { // Comment
+    return single ? null : []
+  }
   if (single) {
-    const node = $el && ($el.matches(selector) ? $el : $el.querySelector(selector))
+    const node = $el.matches(selector) ? $el : $el.querySelector(selector)
     if (node) {
       return getNodeInfo(node, fields)
     }
     return null
-  } else if (!$el) {
-    return []
   } else {
     let infos = []
     const nodeList = $el.querySelectorAll(selector)

src/core/vue.js

@@ -7,7 +7,7 @@ import {
 
 export default function initVue (Vue) {
   Vue.config.errorHandler = function (err) {
-    const app = getApp()
+    const app = typeof getApp === 'function' && getApp()
     if (app && hasLifecycleHook(app.$options, 'onError')) {
       app.__call_hook('onError', err)
     } else {