[gnome-photos] base-item: Don't open items without a default app

[Debarshi Ray <debarshir src gnome org>]

commit c6363defff652727cdd196e6e9f4ce75c53da0e6
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Dec 11 16:25:52 2015 +0100

    base-item: Don't open items without a default app
    
    It can happen that a LocalItem didn't set a default application either
    because the MIME type was unknown, or because no application could be
    found. Don't try to force it open if that happens.
    
    Original patch from Bastien Nocera for gnome-documents.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=740434

 src/photos-base-item.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-base-item.c b/src/photos-base-item.c
index eb9a05d..98cef17 100644
--- a/src/photos-base-item.c
+++ b/src/photos-base-item.c
@@ -387,6 +387,9 @@ photos_base_item_default_open (PhotosBaseItem *self, GdkScreen *screen, guint32
   PhotosBaseItemPrivate *priv = self->priv;
   GError *error;
 
+  if (priv->default_app_name == NULL)
+    return;
+
   error = NULL;
   gtk_show_uri (screen, priv->uri, timestamp, &error);
   if (error != NULL)