Web Resource plugins fails on WebResourceContainer invalid thumbnail Url

If the optional WebResourceContainer thumbnail cannot be accessed(does not exist), the plugin will fail and serviio will continuously try to access the thumbnail. Serviio should report and ignore the failure just as it does if thumbnails for feed items cannot be accessed.
Line 618: 2016-02-09 13:20:03,683 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 620: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 624: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 629: 2016-02-09 13:21:05,881 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 631: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 635: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 640: 2016-02-09 13:22:08,115 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 642: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 646: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 651: 2016-02-09 13:23:10,879 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 653: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 657: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 662: 2016-02-09 13:24:12,998 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 664: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 668: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 804: 2016-02-09 13:28:06,613 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 821: 2016-02-09 13:28:07,240 WARN  [OnlineItemService] Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 822: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 883: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 1009: 2016-02-09 13:28:18,408 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 1011: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1015: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 1022: 2016-02-09 13:28:31,335 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 1023: 2016-02-09 13:28:31,840 WARN  [OnlineItemService] Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1024: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1085: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 1150: 2016-02-09 13:29:00,355 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 1151: 2016-02-09 13:29:00,921 WARN  [OnlineItemService] Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1152: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1213: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
    Line 1278: 2016-02-09 13:29:07,140 DEBUG [OnlineLibraryManager] Thumbnail 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' not in cache yet, loading it
    Line 1279: 2016-02-09 13:29:07,622 WARN  [OnlineItemService] Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1280: org.serviio.library.online.CannotRetrieveThumbnailException: Failed to download thumbnail https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg.
    Line 1341: Caused by: org.serviio.util.HttpConnectionException: URL 'https://i.ytimg.com/vi/ajDL2yoNwqk/maxresdefault.jpg' returned status code '404'
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