Image binding MVC actionresult razor view

Question

Hi all I am binding the img tag as follows

<img alt="" src='@Url.Action("UserImage", "Home")' class="avatar img-circle img-thumbnail" />

This is my code to get the image from the database

[HttpGet]
public ActionResult UserImage()
{
string user = Session["UserName"] as string;
byte[] photo = null;
var v = db.table.Where(p => p.USER_NAME == user).Select(img => img.PHOTO).FirstOrDefault();
if (v != null)
{
photo = v;
return File(photo, "image/jpeg");
}
else
return null;
}

This is displaying image when I have in the database but when it is null it is displaying as follows, instead of that i need to bind src tag with empty