fix office 2007 trouble

internal/tools/tools.go

@@ -309,6 +309,11 @@ func handleFile(file *excelize.File, sheet, cell, content, s3Prefix string, noAc
 		urle = s3Prefix + urle
 	}
 
+	if urle == "" {
+		noAccept[content] = struct{}{}
+		return
+	}
+
 	fmt.Println("ORRRRR", urle, s3Prefix)
 	display, tooltip := urle, urle
 
@@ -321,6 +326,21 @@ func handleFile(file *excelize.File, sheet, cell, content, s3Prefix string, noAc
 	}); err != nil {
 		fmt.Println(err.Error())
 	}
+
+	styleID, err := file.NewStyle(&excelize.Style{
+		Font: &excelize.Font{
+			Color:     "0000FF",
+			Underline: "single",
+		},
+	})
+	if err != nil {
+		fmt.Println("NewStyle error:", err.Error())
+	} else {
+		if err := file.SetCellStyle(sheet, cell, cell, styleID); err != nil {
+			fmt.Println("SetCellStyle error:", err.Error())
+		}
+	}
+
 	noAccept[content] = struct{}{}
 }