[gimp] Revert "app: make unattached vectors enable to rotate."

[ONO Yoshio <onoyoshio src gnome org>]

commit 1ff9487d0051c43e4e4e9e8d19924993d12f4630
Author: ONO Yoshio <ohtsuka yoshio gmail com>
Date:   Thu Sep 6 07:34:54 2018 +0900

    Revert "app: make unattached vectors enable to rotate."
    
    This reverts commit 2d415f53bf582b9cfabe049fd3d95a274b3e39e9.

 app/core/gimpitem.c       | 1 +
 app/vectors/gimpvectors.c | 7 +++----
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/app/core/gimpitem.c b/app/core/gimpitem.c
index 688daebeea..363ee52eec 100644
--- a/app/core/gimpitem.c
+++ b/app/core/gimpitem.c
@@ -1663,6 +1663,7 @@ gimp_item_rotate (GimpItem         *item,
   gboolean       push_undo;
 
   g_return_if_fail (GIMP_IS_ITEM (item));
+  g_return_if_fail (gimp_item_is_attached (item));
   g_return_if_fail (GIMP_IS_CONTEXT (context));
 
   item_class = GIMP_ITEM_GET_CLASS (item);
diff --git a/app/vectors/gimpvectors.c b/app/vectors/gimpvectors.c
index 458d102114..e9fe9d25ae 100644
--- a/app/vectors/gimpvectors.c
+++ b/app/vectors/gimpvectors.c
@@ -582,10 +582,9 @@ gimp_vectors_rotate (GimpItem         *item,
 
   gimp_vectors_freeze (vectors);
 
-  if (gimp_item_is_attached (item))
-    gimp_image_undo_push_vectors_mod (gimp_item_get_image (item),
-                                      _("Rotate Path"),
-                                      vectors);
+  gimp_image_undo_push_vectors_mod (gimp_item_get_image (item),
+                                    _("Rotate Path"),
+                                    vectors);
 
   for (list = vectors->strokes->head; list; list = g_list_next (list))
     {