fix: icon type change will cause error when icon undefined

Author: JuneAndGreen

package.json

@@ -1,6 +1,6 @@
 {
   "name": "weui-miniprogram",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "description": "小程序 WeUI 组件库",
   "main": "miniprogram_dist/index.js",
   "files": [

src/icon/icon.ts

@@ -44,7 +44,8 @@ Component({
             this._genSrc(iconData[v][getFixedIconType(this.data.type)])
         },
         _genSrcByType(v) {
-            this._genSrc(iconData[this.data.icon][getFixedIconType(v)])
+            const iconDataItem = iconData[this.data.icon]
+            if (iconDataItem) this._genSrc(iconDataItem[getFixedIconType(v)])
         },
         _genSrc(rawData) {
             if (!rawData) return // type 不存在