[shotwell] Panic out if we cannot open the initial file

[Jens Georg <jensgeorg src gnome org>]

commit 7695f742b2225d99136de2e01dac926fe4cc80c2
Author: Jens Georg <mail jensge org>
Date:   Sat May 21 18:07:43 2016 +0200

    Panic out if we cannot open the initial file

 src/direct/DirectPhotoPage.vala |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/src/direct/DirectPhotoPage.vala b/src/direct/DirectPhotoPage.vala
index 6225a65..3d23528 100644
--- a/src/direct/DirectPhotoPage.vala
+++ b/src/direct/DirectPhotoPage.vala
@@ -242,7 +242,12 @@ public class DirectPhotoPage : EditingHostPage {
         
         DirectPhoto? photo = DirectPhoto.global.get_file_source(initial_file);
         
-        display_mirror_of(view_controller, photo);
+        if (photo != null) {
+            display_mirror_of(view_controller, photo);
+        } else {
+            AppWindow.panic(_("Unable open photo %s. Sorry.").printf(initial_file.get_path()));
+        }
+
         initial_file = null;
     }