[dconf-editor] Some i18n fixes.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 36d8a2a22e07aec0aaefc23e8bbcbd677cd4afda
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Nov 29 18:40:58 2017 +0100

    Some i18n fixes.

 editor/dconf-model.vala |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/editor/dconf-model.vala b/editor/dconf-model.vala
index 5992ec0..85934ff 100644
--- a/editor/dconf-model.vala
+++ b/editor/dconf-model.vala
@@ -492,6 +492,12 @@ public class GSettingsKey : Key
 
     public GSettingsKey (Directory parent, string name, GLib.Settings settings, string schema_id, string 
summary, string description, string type_string, Variant default_value, string range_type, Variant 
range_content)
     {
+        string? summary_nullable = summary.locale_to_utf8 (-1, null, null, null);
+        summary = summary_nullable ?? summary;
+
+        string? description_nullable = description.locale_to_utf8 (-1, null, null, null);
+        description = description_nullable ?? description;
+
         Object (full_name: parent.full_name + name,
                 name: name,
                 // schema infos