fix：解决多余的符号导致报表无法打开问题

src/business/platform/file/attachment/selector.vue

@@ -532,7 +532,7 @@ export default {
         handlePreview (index) {
             const data = this.selectorValue[index]
             if (this.operation_status !== 'fileTraining') {
-                this.attachment = this.multiple ? this.selectorValue[index] : this.selectorValue``
+                this.attachment = this.multiple ? this.selectorValue[index] : this.selectorValue
                 if (supportFileTypes.includes(this.attachment.ext)) {
                     this.getPreview(index)
                     this.filePreviewVisible = true