fix ElemeFE#13049 Improve robustness

Author: yoyo837

packages/select/src/select.vue

@@ -185,8 +185,8 @@
 
       showClose() {
         let hasValue = this.multiple
-          ? this.value.length > 0
-          : this.value !== undefined && this.value !== null && this.value !== '';
+          ? Array.isArray(this.value) && this.value.length > 0
+          : this.value != null && this.value !== '';
         let criteria = this.clearable &&
           !this.selectDisabled &&
           this.inputHovering &&