[gimp] Don't call gimp_display_get_image() on a NULL display

[Michael Natterer <mitch src gnome org>]

commit e57b0eee633e7c8ae6cb677391e05d14dbb1ad58
Author: Michael Natterer <mitch gimp org>
Date:   Wed Oct 7 19:46:01 2009 +0200

    Don't call gimp_display_get_image() on a NULL display

 app/tools/gimprectangletool.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/app/tools/gimprectangletool.c b/app/tools/gimprectangletool.c
index 10b75f5..9f1102f 100644
--- a/app/tools/gimprectangletool.c
+++ b/app/tools/gimprectangletool.c
@@ -4124,8 +4124,8 @@ gimp_rectangle_tool_get_constraints (GimpRectangleTool       *rect_tool,
                                      gint                    *max_y,
                                      GimpRectangleConstraint  constraint)
 {
-  GimpTool  *tool  = GIMP_TOOL (rect_tool);
-  GimpImage *image = gimp_display_get_image (tool->display);
+  GimpTool  *tool = GIMP_TOOL (rect_tool);
+  GimpImage *image;
   gint       min_x_dummy;
   gint       min_y_dummy;
   gint       max_x_dummy;
@@ -4144,6 +4144,8 @@ gimp_rectangle_tool_get_constraints (GimpRectangleTool       *rect_tool,
   if (! tool->display)
     return;
 
+  image = gimp_display_get_image (tool->display);
+
   switch (constraint)
     {
     case GIMP_RECTANGLE_CONSTRAIN_IMAGE: