buildertool: Be more robust

Don't pass a NULL string to gtk_builder_value_from_string.

diff --git a/tools/gtk-builder-tool-simplify.c b/tools/gtk-builder-tool-simplify.c
index 635b6332fab702baf10fef2d6efa0382cdf0d820..7aadefa1608fa9592a7eb7fb8a72799755d5105a 100644 (file)
--- a/tools/gtk-builder-tool-simplify.c
+++ b/tools/gtk-builder-tool-simplify.c
@@ -432,6 +432,9 @@ value_is_default (Element      *element,
   if (g_type_is_a (G_PARAM_SPEC_VALUE_TYPE (pspec), G_TYPE_BOXED))
     return FALSE;
 
+  if (!value_string)
+    return FALSE;
+
   if (!gtk_builder_value_from_string (data->builder, pspec, value_string, &value, &error))
     {
       g_printerr (_("%s:%d: Couldn’t parse value for property '%s': %s\n"), data->input_filename, element->line_number, pspec->name, error->message);