pbutils: Avoid assertion describing raw audio caps without format

We used to get:

    gst_audio_format_from_string: assertion 'format != NULL' failed

diff --git a/gst-libs/gst/pbutils/descriptions.c b/gst-libs/gst/pbutils/descriptions.c
index 383bb1c..7a90381 100644 (file)
--- a/gst-libs/gst/pbutils/descriptions.c
+++ b/gst-libs/gst/pbutils/descriptions.c
@@ -823,11 +823,12 @@ format_info_get_desc (const FormatInfo * info, const GstCaps * caps)
     gint depth = 0;
     gboolean is_float;
     const gchar *str;
-    GstAudioFormat format;
+    GstAudioFormat format = GST_AUDIO_FORMAT_UNKNOWN;
     const GstAudioFormatInfo *finfo;
 
     str = gst_structure_get_string (s, "format");
-    format = gst_audio_format_from_string (str);
+    if (str)
+      format = gst_audio_format_from_string (str);
     if (format == GST_AUDIO_FORMAT_UNKNOWN)
       return g_strdup (_("Uncompressed audio"));