[gnome-builder] git: fix line check

[Christian Hergert <chergert src gnome org>]

commit 86a73a8c200ebb5d8675cbe2acafc447ec942886
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 12 01:47:29 2018 -0700

    git: fix line check
    
    We want to check for NULL, we don't care about empty length.

 src/plugins/git/ide-git-buffer-change-monitor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/plugins/git/ide-git-buffer-change-monitor.c b/src/plugins/git/ide-git-buffer-change-monitor.c
index d81596b95..676720a7b 100644
--- a/src/plugins/git/ide-git-buffer-change-monitor.c
+++ b/src/plugins/git/ide-git-buffer-change-monitor.c
@@ -224,7 +224,7 @@ ide_git_buffer_change_monitor_get_change (IdeBufferChangeMonitor *monitor,
   DiffLine key = { line + 1, 0 }; /* Git is 1-based */
   DiffLine *ret;
 
-  if (self->lines == NULL || self->lines->len == 0)
+  if (self->lines == NULL || self->lines->data == NULL)
     {
       /* If within working directory, synthesize line addition. */
       if (self->is_child_of_workdir)