bug fixes

package.json

 {
   "name": "@ezijing/vue-form",
-  "version": "2.0.12",
+  "version": "2.0.13",
   "private": false,
   "description": "基于Vue Element-UI的表单",
   "scripts": {

src/packages/input/src/main.vue

@@ -26,7 +26,7 @@ export default {
   },
   methods: {
     onBlur() {
-      this.data[this.options.model] = this.currentValue.trim()
+      this.data[this.options.model] = this.currentValue ? this.currentValue.trim() : this.currentValue
     }
   }
 }