[gnome-builder/wip/gtk4-port: 1402/1774] plugins/git: fix warning in notify of current branch

[Christian Hergert <chergert src gnome org>]

commit 6788caa9c1434beb280ef39dc9b64d681ca5f5cd
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 7 16:59:58 2022 -0700

    plugins/git: fix warning in notify of current branch
    
    Likely only visible on first commit.

 src/plugins/git/daemon/ipc-git-repository-impl.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/src/plugins/git/daemon/ipc-git-repository-impl.c 
b/src/plugins/git/daemon/ipc-git-repository-impl.c
index 61df7a4c4..8fe7b60cc 100644
--- a/src/plugins/git/daemon/ipc-git-repository-impl.c
+++ b/src/plugins/git/daemon/ipc-git-repository-impl.c
@@ -64,9 +64,10 @@ static void
 ipc_git_repository_impl_monitor_changed_cb (IpcGitRepositoryImpl *self,
                                             IpcGitIndexMonitor   *monitor)
 {
+  g_autoptr(GgitRef) head_ref = NULL;
+  const char *shortname = NULL;
   GHashTableIter iter;
   gpointer key;
-  g_autoptr(GgitRef) head_ref = NULL;
 
   g_assert (IPC_IS_GIT_REPOSITORY_IMPL (self));
   g_assert (IPC_IS_GIT_INDEX_MONITOR (monitor));
@@ -79,9 +80,16 @@ ipc_git_repository_impl_monitor_changed_cb (IpcGitRepositoryImpl *self,
       ipc_git_change_monitor_impl_reset (change_monitor);
     }
 
-  head_ref = ggit_repository_get_head (self->repository, NULL);
-  g_assert (GGIT_IS_REF (head_ref));
-  ipc_git_repository_set_branch ((IpcGitRepository *)self, ggit_ref_get_shorthand (head_ref));
+  if ((head_ref = ggit_repository_get_head (self->repository, NULL)))
+    {
+      g_assert (GGIT_IS_REF (head_ref));
+      shortname = ggit_ref_get_shorthand (head_ref);
+    }
+
+  if (shortname == NULL)
+    shortname = "main";
+
+  ipc_git_repository_set_branch ((IpcGitRepository *)self, shortname);
   ipc_git_repository_emit_changed (IPC_GIT_REPOSITORY (self));
 }