Clip events observers doesn't work properly

[dn-antropov]

When I try to observe events for multiple clips, e.g. removal or creation of more than one clip, observers doesn't do shit. For more than one clip I start getting observables only on my second action.

If I do changes for only one clip everything works as expected without that weird repeatition of action to register changes.

[dn-antropov]

Quick fix is to create mock clip and immedietly delete it, but that needs further investigation