[gnome-builder/gnome-builder-3-26] symbol-tree: ignore empty trees

[Christian Hergert <chergert src gnome org>]

commit e4c9243f1e429b7a9c66cfc668af7a09148b3597
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jan 6 03:59:04 2018 -0800

    symbol-tree: ignore empty trees
    
    We might get a valid tree pointer back, but it contains no
    children nodes. In this case, simply ignore the tree and
    instead try the next symbol resolver who might have something
    more interesting.

 .../symbol-tree/gbp-symbol-layout-stack-addin.c    |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c 
b/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
index 5575101..2b0233b 100644
--- a/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
+++ b/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
@@ -229,8 +229,12 @@ gbp_symbol_layout_stack_addin_get_symbol_tree_cb (GObject      *object,
 
   g_ptr_array_remove_index (data->resolvers, data->resolvers->len - 1);
 
+  /* Ignore empty trees, in favor of next symbol resovler */
+  if (tree != NULL && ide_symbol_tree_get_n_children (tree, NULL) == 0)
+    g_clear_object (&tree);
+
   /* If tree is not fetched and symbol resolvers are left then try those */
-  if (tree == NULL && data->resolvers->len)
+  if (tree == NULL && data->resolvers->len > 0)
     {
       GFile *file;
       IdeSymbolResolver *resolver;