fix failing case where resource needs to be recreated

vault/resource_mount.go

@@ -300,15 +300,15 @@ func readMount(d *schema.ResourceData, meta interface{}, excludeType bool) error
 	log.Printf("[DEBUG] Reading mount %s from Vault", path)
 
 	mount, err := getMountIfPresent(client, path)
-	if err != nil {
-		return err
-	}
-
 	if mount == nil {
 		d.SetId("")
 		return nil
 	}
 
+	if err != nil {
+		return err
+	}
+
 	if !excludeType {
 		if cfgType, ok := d.GetOk("type"); ok {
 			// kv-v2 is an alias for kv, version 2. Vault will report it back as "kv"