CN-965 知识库Preview：1.一条一条删除数据，直到删除完毕，列表未显示nodata；2.列表没有数据时，不弹出对话框；3.删除最后一条记录时报错；4.导入数据中，此时点击报错按钮，报错；

src/views/setting/KnowledgeBaseForm.vue

@@ -431,8 +431,7 @@ export default {
       if (this.fileList.length > 0 && this.fileList[0].status === 'success') {
         this.fileListBack = this.fileList[0]
       }
-      const file = fileList.slice(-1)
+      this.fileList = fileList.slice(-1)
-      this.fileList = file
     },
     uploadError () {
       this.uploadLoading = false
@@ -481,6 +480,7 @@ export default {
         this.editTagErrorTip = ''
         this.editIndex = -1
         this.isPreviewChange = true
+        this.importedDataNoData = true
       }
       if (this.fileListBack !== undefined && this.fileListBack.status === 'success' &&
             this.importedData.length > 0) {
@@ -491,6 +491,7 @@ export default {
       if (!this.isShowUploadTips) {
         this.isShowUploadTips = true
         const self = this
+        if (this.importedData.length > 0) {
           this.$confirm(this.$t('tip.uploadFile'), {
             confirmButtonText: this.$t('tip.confirm'),
             cancelButtonText: this.$t('overall.cancel'),
@@ -505,6 +506,11 @@ export default {
           }).catch(e => {}).finally(() => {
             this.isShowUploadTips = false
           })
+        } else {
+          this.isClick = true
+          this.isShowUploadTips = false
+          self.$refs.upload.$refs.uploadRef.handleClick()
+        }
       }
     },
     promiseState (p) {
@@ -525,6 +531,7 @@ export default {
           reject(new Error(this.$t('validate.fileSizeLimit', { size: unitConvert(this.uploadFileSizeLimit, unitTypes.byte).join('') })))
         } else {
           if (!this.isClick) {
+            if (this.importedData.length > 0) {
               this.$confirm(this.$t('tip.uploadFile'), {
                 confirmButtonText: this.$t('tip.confirm'),
                 cancelButtonText: this.$t('overall.cancel'),
@@ -541,6 +548,9 @@ export default {
             } else {
               resolve()
             }
+          } else {
+            resolve()
+          }
         }
       })
       return promise
@@ -575,7 +585,7 @@ export default {
       // 删除内容为空的新增记录
       const lastIndex = this.importedData.length - 1
       const lastData = this.importedData[lastIndex]
-      if (lastData.tagItem === '' && lastData.tagValue === '') {
+      if (lastData !== undefined && lastData.tagItem === '' && lastData.tagValue === '') {
         this.importedData.pop()
       }
       this.importedPageObj.total = this.importedData.length
@@ -639,10 +649,14 @@ export default {
           this.previewErrorTip = ''
         }
         if (valid) {
+          if (this.$refs.editForm) {
             this.$refs.editForm.validate((validImportData) => {
               if (validImportData) {
                 // 校验通过后组织数据、请求接口
                 if (valid && !this.uploadErrorTip && !this.previewErrorTip) {
+                  if (this.importedData.length === 1 && this.importedData[0].tagItem === '') {
+                    // this.blockOperation.save = false
+                  } else {
                     const postData = {
                       tagName: this.editObject.tagName,
                       tagType: this.editObject.tagType,
@@ -714,6 +728,7 @@ export default {
                         this.blockOperation.save = false
                       })
                     }
+                  }
                 } else {
                   this.blockOperation.save = false
                 }
@@ -724,6 +739,9 @@ export default {
           } else {
             this.blockOperation.save = false
           }
+        } else {
+          this.blockOperation.save = false
+        }
       })
     },
     hasErrorImportedData () {
@@ -806,11 +824,13 @@ export default {
         if (total > 0 && total < 10) {
           this.importedData.push({ tagItem: '', tagValue: '', status: 1 })
           this.showImportedData.push({ tagItem: '', tagValue: '', status: 1 })
+          this.importedDataNoData = false
         } else {
           const lastPageSize = Math.ceil((total + 1) / 10)
           this.pageNo(lastPageSize)
           this.importedData.push({ tagItem: '', tagValue: '', status: 1 })
           this.showImportedData.push({ tagItem: '', tagValue: '', status: 1 })
+          this.importedDataNoData = false
         }
         this.importedPageObj.total = this.importedData.length
         this.timer = setTimeout(() => {