Logging that the DO droplet wasn't found before removing it

builtin/providers/digitalocean/resource_digitalocean_droplet.go

@@ -190,6 +190,7 @@ func resourceDigitalOceanDropletRead(d *schema.ResourceData, meta interface{}) e
 	if err != nil {
 		// check if the droplet no longer exists.
 		if resp.StatusCode == 404 {
+			log.Printf("[WARN] DigitalOcean Droplet (%s) not found", d.Id())
 			d.SetId("")
 			return nil
 		}