[tracker-miners] tracker-extract: Skip over virtual elements

[Carlos Garnacho <carlosg src gnome org>]

commit a0da953c8637bef4ddb963e0d459dfa37b5a643a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Sep 12 15:13:46 2017 +0200

    tracker-extract: Skip over virtual elements
    
    It is possible to fool tracker-extract into processing virtual elements
    that aren't backed up by files. Those can be safely ignored instead.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785853

 src/tracker-extract/tracker-extract-decorator.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-decorator.c b/src/tracker-extract/tracker-extract-decorator.c
index cfb51d7..6e251f4 100644
--- a/src/tracker-extract/tracker-extract-decorator.c
+++ b/src/tracker-extract/tracker-extract-decorator.c
@@ -264,6 +264,12 @@ decorator_next_item_cb (TrackerDecorator *decorator,
 
                g_clear_error (&error);
                return;
+       } else if (!tracker_decorator_info_get_url (info)) {
+               /* Skip virtual elements with no real file representation */
+               priv->n_extracting_files--;
+               tracker_decorator_info_unref (info);
+               decorator_get_next_file (decorator);
+               return;
        }
 
        data = g_new0 (ExtractData, 1);