[gnome-builder] project-tree: don't override dim-label color

[Christian Hergert <chergert src gnome org>]

commit 11b51c46151c4d198472ebf8fd1725a99be70269
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jan 7 20:20:12 2018 -0800

    project-tree: don't override dim-label color

 src/plugins/project-tree/gb-vcs-tree-builder.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/project-tree/gb-vcs-tree-builder.c b/src/plugins/project-tree/gb-vcs-tree-builder.c
index 4cbf632..75d50f1 100644
--- a/src/plugins/project-tree/gb-vcs-tree-builder.c
+++ b/src/plugins/project-tree/gb-vcs-tree-builder.c
@@ -62,7 +62,11 @@ gb_vcs_tree_builder_cell_data_func (DzlTreeBuilder  *builder,
   if (!GTK_IS_CELL_RENDERER_TEXT (cell))
     goto unset;
 
+  /* try to not touch anything if we're NULL (the empty node) */
   item = dzl_tree_node_get_item (node);
+  if (item == NULL)
+    return;
+
   if (!GB_IS_PROJECT_FILE (item))
     goto unset;