LB-842: When a chained blog provider is deleted, the already selected blogs still appear on chained blog source
* chained blogs (in liveblog, liveblog-sync) filtered for having providers (or none origin_uri as legacy)
Merge branch 'liveblog-15' into lb-842-hide-orphan-chained-blogs
LB-842: When a chained blog provider is deleted, the already selected blogs still appear on chained blog source
* updating the source on re-enabling a chained blog
Merge pull request #259 from msat-cont/lb-842-hide-orphan-chained-blogs

Lb 842 hide orphan chained blogs