[gnome-builder] code-index: log file that contained no entries

[Christian Hergert <chergert src gnome org>]

commit f450495f7dc186188d1d3c0ba1501177e01965f2
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 18 15:41:10 2018 -0800

    code-index: log file that contained no entries
    
    Just to simplify the process of locating what indexers are at play.

 src/plugins/code-index/ide-persistent-map-builder.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/code-index/ide-persistent-map-builder.c 
b/src/plugins/code-index/ide-persistent-map-builder.c
index 9868ff018..001598d00 100644
--- a/src/plugins/code-index/ide-persistent-map-builder.c
+++ b/src/plugins/code-index/ide-persistent-map-builder.c
@@ -185,10 +185,13 @@ ide_persistent_map_builder_write_worker (GTask        *task,
 
   if (state->keys->len == 0)
     {
+      g_autofree gchar *path = g_file_get_path (state->destination);
+
       g_task_return_new_error (task,
                                G_IO_ERROR,
                                G_IO_ERROR_INVALID_DATA,
-                               "No entries to write");
+                               "No entries to write for \"%s\"",
+                               path);
       return;
     }