[gitg/gnome-3-20] Avoid submodule iteration on bare repositories due to libgit2 bug

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 8d8a1f9f6c7301081f3e4f6078f1dbf0723aa2a9
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Thu Aug 18 11:04:31 2016 +0200

    Avoid submodule iteration on bare repositories due to libgit2 bug

 libgitg/gitg-stage-status-enumerator.vala |   31 ++++++++++++++++------------
 1 files changed, 18 insertions(+), 13 deletions(-)
---
diff --git a/libgitg/gitg-stage-status-enumerator.vala b/libgitg/gitg-stage-status-enumerator.vala
index 147474b..58290b8 100644
--- a/libgitg/gitg-stage-status-enumerator.vala
+++ b/libgitg/gitg-stage-status-enumerator.vala
@@ -292,22 +292,27 @@ public class StageStatusEnumerator : Object
 
                var submodule_paths = new Gee.HashSet<string>();
 
-               try
+               // Due to a bug in libgit2, submodule iteration crashes when performed
+               // on a bare repository
+               if (!d_repository.is_bare)
                {
-                       d_repository.submodule_foreach((submodule, name) => {
-                               submodule_paths.add(submodule.get_path());
+                       try
+                       {
+                               d_repository.submodule_foreach((submodule, name) => {
+                                       submodule_paths.add(submodule.get_path());
 
-                               if (!d_ignored_submodules.contains(name))
-                               {
-                                       try
+                                       if (!d_ignored_submodules.contains(name))
                                        {
-                                               add(new 
StageStatusSubmodule(d_repository.lookup_submodule(name)));
-                                       } catch {}
-                               }
-
-                               return d_cancellable.is_cancelled() ? 1 : 0;
-                       });
-               } catch {}
+                                               try
+                                               {
+                                                       add(new 
StageStatusSubmodule(d_repository.lookup_submodule(name)));
+                                               } catch {}
+                                       }
+
+                                       return d_cancellable.is_cancelled() ? 1 : 0;
+                               });
+                       } catch {}
+               }
 
                try
                {