[SD-1240] Only empty stages can be deleted
fix(ingest): send content to desk if any.
Update to PR#449.

patch() was replaced with update() which makes _type being saved into archive collection in Mongo
Removed redundant attribute 'user'
Replaced string fetched with constant
fix(sync): sync without celery
[SD-1240] Only empty stages can be deleted - test improvements
Merge pull request #436 from petrjasek/fix-sync

fix(sync): check if item is still in mongo when syncing
Merge pull request #450 from akintolga/master

[SD-1240] Only empty stages can be deleted
assign task statuses to desk stages