TD-2865: File selected check included

Author: sarathlal-sarangadharan

DigitalLearningSolutions.Web/Controllers/TrackingSystem/Delegates/BulkUploadController.cs

@@ -80,16 +80,19 @@ public IActionResult StartUpload()
         public IActionResult StartUpload(UploadDelegatesViewModel model)
         {
             int MaxBulkUploadRows = GetMaxBulkUploadRowsLimit();
-            var workbook = new XLWorkbook(model.DelegatesFile.OpenReadStream());
-            if (!workbook.Worksheets.Contains(DelegateDownloadFileService.DelegatesSheetName))
+            if (model.DelegatesFile != null)
             {
-                ModelState.AddModelError("MaxBulkUploadRows", CommonValidationErrorMessages.InvalidExcelValidationMessage);
-                return View("StartUpload", model);
-            }
-            int ExcelRowsCount = delegateUploadFileService.GetBulkUploadExcelRowCount(model.DelegatesFile);
-            if (ExcelRowsCount > MaxBulkUploadRows)
-            {
-                ModelState.AddModelError("MaxBulkUploadRows", string.Format(CommonValidationErrorMessages.MaxBulkUploadRowsLimit, MaxBulkUploadRows));
+                var workbook = new XLWorkbook(model.DelegatesFile.OpenReadStream());
+                if (!workbook.Worksheets.Contains(DelegateDownloadFileService.DelegatesSheetName))
+                {
+                    ModelState.AddModelError("MaxBulkUploadRows", CommonValidationErrorMessages.InvalidExcelValidationMessage);
+                    return View("StartUpload", model);
+                }
+                int ExcelRowsCount = delegateUploadFileService.GetBulkUploadExcelRowCount(model.DelegatesFile);
+                if (ExcelRowsCount > MaxBulkUploadRows)
+                {
+                    ModelState.AddModelError("MaxBulkUploadRows", string.Format(CommonValidationErrorMessages.MaxBulkUploadRowsLimit, MaxBulkUploadRows));
+                }
             }
             if (!ModelState.IsValid)
             {