fix: Filter blank sheet

--bug=1052097 --user=刘瑞斌 【github#2196】【应用编排】应用对话的时候上传带空白sheet的表格会报错 https://www.tapd.cn/57709429/s/1653414

Author: liuruibin

apps/common/handle/impl/table/xls_parse_table_handle.py

@@ -68,6 +68,9 @@ def get_content(self, file, save_image):
             sheets = workbook.sheets()
             md_tables = ''
             for sheet in sheets:
+                # 过滤空白的sheet
+                if sheet.nrows == 0 or sheet.ncols == 0:
+                    continue
 
                 # 获取表头和内容
                 headers = sheet.row_values(0)