[grilo-plugins] opensubtitles: Fix warnings running gnome-music

[Bastien Nocera <hadess src gnome org>]

commit 5a43255eafaf11f6259b362e73c8fc53745d2b87
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Sep 2 14:40:25 2015 +0200

    opensubtitles: Fix warnings running gnome-music
    
    When running gnome-music, grl_source_query() will call
    expand_operation_keys() to try and find which sources could help add
    metadata.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754451

 src/opensubtitles/grl-opensubtitles.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/opensubtitles/grl-opensubtitles.c b/src/opensubtitles/grl-opensubtitles.c
index 1009128..6237d7e 100644
--- a/src/opensubtitles/grl-opensubtitles.c
+++ b/src/opensubtitles/grl-opensubtitles.c
@@ -558,9 +558,9 @@ grl_opensubtitles_source_may_resolve (GrlSource *source,
       !grl_data_has_key (GRL_DATA (media), GRL_METADATA_KEY_SIZE)) {
     if (missing_keys) {
       GList *keys = NULL;
-      if (!grl_data_has_key (GRL_DATA (media), priv->hash_keyid))
+      if (!media || !grl_data_has_key (GRL_DATA (media), priv->hash_keyid))
         keys = g_list_prepend (keys, GRLKEYID_TO_POINTER (priv->hash_keyid));
-      if (!grl_data_has_key (GRL_DATA (media), GRL_METADATA_KEY_SIZE))
+      if (!media || !grl_data_has_key (GRL_DATA (media), GRL_METADATA_KEY_SIZE))
         keys = g_list_prepend (keys, GRLKEYID_TO_POINTER (GRL_METADATA_KEY_SIZE));
       *missing_keys = keys;
     }