[dconf] Fix crash viewing integer keys with no schema (Bug #644170)

[Robert Ancell <rancell src gnome org>]

commit da23cc46c4e405c035d81918f9392ab33241f49f
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Mar 11 09:09:29 2011 +1100

    Fix crash viewing integer keys with no schema (Bug #644170)

 editor/dconf-view.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/editor/dconf-view.vala b/editor/dconf-view.vala
index 184f9bb..1725af1 100644
--- a/editor/dconf-view.vala
+++ b/editor/dconf-view.vala
@@ -39,7 +39,7 @@ private class KeyValueRenderer: Gtk.CellRenderer
                 spin_renderer.text = key.value.print(false);
                 var v = get_variant_as_double(key.value);
                 double min = 0.0, max = 0.0;
-                if (key.schema.range != null)
+                if (key.schema != null && key.schema.range != null)
                 {
                     min = get_variant_as_double(key.schema.range.min);
                     max = get_variant_as_double(key.schema.range.max);