修复属性绑定

package.json

@@ -1,6 +1,6 @@
 {
   "name": "wkit",
-  "version": "1.10.13",
+  "version": "1.10.14",
   "type": "module",
   "description": "A library for building fast, lightweight web components.",
   "main": "dist/index.js",

src/html.js

@@ -481,7 +481,7 @@ class AttributePart {
     this.$parent = parent
     this.options = options
     if (strings.length > 2 || strings[0] !== '' || strings[1] !== '') {
-      this._$committedValue = new Array(strings.length - 1).fill('')
+      this._$committedValue = Array(strings.length - 1).fill(null)
       this.strings = strings
     } else {
       this._$committedValue = NOTHING