Playlist Catalogue: fix: "Save Current Playlist" may fail silently

- After rebooting, unless the current playlist
had been manually resumed already, the "Save
Current Playlist" option in the root menu's/
playlist catalogue's context menu failed to work.

- Eliminate error message attempting to view current
playlist when no control file present.

Change-Id: I58f1d3dc6f256fcee106ff5a17f69fa46d67b2e4

apps/menus/playlist_menu.c

@@ -48,6 +48,21 @@ int save_playlist_screen(struct playlist_info* playlist)
 
     char temp[MAX_PATH+1], *p;
     int len;
+    bool audio_stopped = !(audio_status() & AUDIO_STATUS_PLAY);
+
+    /* After a reboot, we may need to resume the playlist
+       first, or it will not contain any indices when
+       user selects "Save Current Playlist" from playlist
+       catalogue's context menu in root menu */
+    if (!playlist && audio_stopped && !playlist_get_current()->started)
+    {
+        if (!file_exists(PLAYLIST_CONTROL_FILE) || playlist_resume() == -1)
+       {
+            splash(HZ, ID2P(LANG_CATALOG_NO_PLAYLISTS));
+            return 0;
+        }
+    }
+
 
     catalog_get_directory(directoryonly, sizeof(directoryonly));
     playlist_get_name(playlist, temp, sizeof(temp)-1);

apps/playlist.c

@@ -2048,6 +2048,7 @@ struct playlist_info* playlist_load(const char* dir, const char* file,
     {
         playlist->max_playlist_size = current_playlist.max_playlist_size;
         playlist->indices = current_playlist.indices;
+        current_playlist.started = false;
     }
 
     new_playlist_unlocked(playlist, dir, file);

apps/playlist_viewer.c

@@ -387,7 +387,7 @@ static bool playlist_viewer_init(struct playlist_viewer * viewer,
     if (!filename && !is_playing)
     {
         /* Try to restore the list from control file */
-        if (playlist_resume() == -1)
+        if (!file_exists(PLAYLIST_CONTROL_FILE) || playlist_resume() == -1)
         {
             /* Nothing to view, exit */
             splash(HZ, ID2P(LANG_CATALOG_NO_PLAYLISTS));