Fix bulkload failed bug (#19702)

Signed-off-by: Nyhmo <yihua.mo@zilliz.com>
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

internal/datanode/data_node.go

@@ -1169,6 +1169,17 @@ func importFlushReqFunc(node *DataNode, req *datapb.ImportTaskRequest, res *root
 			rowNum = field.RowNum()
 			break
 		}
+
+		if rowNum <= 0 {
+			log.Info("fields data is empty, no need to generate segment",
+				zap.Int64("task ID", importTaskID),
+				zap.Int("shard ID", shardID),
+				zap.Int("# of channels", len(chNames)),
+				zap.Strings("channel names", chNames),
+			)
+			return nil
+		}
+
 		colID := req.GetImportTask().GetCollectionId()
 		partID := req.GetImportTask().GetPartitionId()
 		segmentIDReq := composeAssignSegmentIDRequest(rowNum, shardID, chNames, colID, partID)

internal/util/importutil/import_wrapper.go

@@ -186,7 +186,7 @@ func (p *ImportWrapper) fileValidation(filePaths []string, rowBased bool) error
 		size, err := p.chunkManager.Size(context.TODO(), filePath)
 		if err != nil {
 			log.Error("import wrapper: failed to get file size", zap.String("filePath", filePath), zap.Any("err", err))
-			return errors.New("failed to ")
+			return errors.New("failed to get file size of " + filePath)
 		}
 
 		if size == 0 {