From 266481e9ff77392163d60297ebcfed4c2cf1b62e Mon Sep 17 00:00:00 2001
From: Stefan Sauer <ensonic@users.sf.net>
Date: Sun, 4 Jan 2015 23:24:53 +0100
Subject: [PATCH] preset: don't return empty preset lists

Add a shortcut for the cases where an element implements the preset iface but
has no presets and return NULL instead of an empty list in that case.
---
 gst/gstpreset.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gst/gstpreset.c b/gst/gstpreset.c
index 6953508a06..ee5a4a5eb3 100644
--- a/gst/gstpreset.c
+++ b/gst/gstpreset.c
@@ -456,6 +456,12 @@ gst_preset_default_get_preset_names (GstPreset * preset)
       groups[num_groups] = NULL;
     }
   }
+  if (!num_groups) {
+    GST_INFO_OBJECT (preset, "Empty preset file");
+    g_strfreev (groups);
+    return NULL;
+  }
+
   /* sort the array now */
   g_qsort_with_data (groups, num_groups, sizeof (gchar *),
       (GCompareDataFunc) strcmp, NULL);