838d6f6eea
Fix exception when uploading these types of URLs: * http://img12.pixiv.net/profile/rapattu/119950.jpg * http://i2.pixiv.net/img130/profile/minono_aki/8733472.jpg * http://i2.pixiv.net/img20/img/a-park/novel/3607898.jpg * http://i1.pixiv.net/novel-cover-original/img/2016/11/03/20/10/58/7436075_f75af69f3eacd1656d3733c72aa959cf.jpg * http://i1.pixiv.net/background/img/2016/05/17/12/05/48/2074388_d4ac52034f7ca0af3e083d59fde7e97f.jpg Skip rewriting sources that don't have illust IDs to avoid this exception. Also fix `tags` so that it doesn't blow up when fetching source data for these types of sources.
