[libgda] Correction for bug #742312

[Vivien Malerba <vivien src gnome org>]

commit eeba322e44caf257d7d699e05c5a6b51f3782c1e
Author: Vivien Malerba <malerba gnome-db org>
Date:   Sun Jan 11 21:52:20 2015 +0100

    Correction for bug #742312

 tools/browser/canvas/browser-canvas.c |   31 +++++++++++++++++--------------
 1 files changed, 17 insertions(+), 14 deletions(-)
---
diff --git a/tools/browser/canvas/browser-canvas.c b/tools/browser/canvas/browser-canvas.c
index 7ac57bf..a93ec80 100644
--- a/tools/browser/canvas/browser-canvas.c
+++ b/tools/browser/canvas/browser-canvas.c
@@ -897,29 +897,32 @@ browser_canvas_perform_auto_layout (BrowserCanvas *canvas, gboolean animate, Bro
                
                tmp = g_strdup_printf ("%p", item);
 #ifdef GRAPHVIZ_NEW_API
-               node = agnode (graph, tmp, 0);
+               node = agnode (graph, tmp, 1);
 #else
                node = agnode (graph, tmp);
 #endif
                nl->node = node;
                g_hash_table_insert (nodes_hash, item, node);
-               
-               tmp = g_strdup_printf ("%p", node);
-               agset (node, "label", tmp);
-               g_free (tmp);
-               
                goo_canvas_item_get_bounds (GOO_CANVAS_ITEM (item), &bounds);
                nl->width = bounds.x2 - bounds.x1;
                nl->height = bounds.y2 - bounds.y1;
                val = (bounds.y2 - bounds.y1) / GV_SCALE;
-               tmp = g_strdup_printf ("%.3f", val);
-               agset (node, "height", tmp);
-               g_free (tmp);
-               val = (bounds.x2 - bounds.x1) / GV_SCALE;
-               tmp = g_strdup_printf ("%.3f", val);
-               agset (node, "width", tmp);
-               g_free (tmp);
-               
+
+               if (node) {
+                       tmp = g_strdup_printf ("%p", node);
+                       agset (node, "label", tmp);
+                       g_free (tmp);
+
+                       tmp = g_strdup_printf ("%.3f", val);
+                       agset (node, "height", tmp);
+                       g_free (tmp);
+
+                       val = (bounds.x2 - bounds.x1) / GV_SCALE;
+                       tmp = g_strdup_printf ("%.3f", val);
+                       agset (node, "width", tmp);
+                       g_free (tmp);
+               }
+
                nl->start_x = bounds.x1;
                nl->start_y = bounds.y1;
                nl->cur_x = nl->start_x;