Planner FollowUps - Keeps creating messages for searches that have been removed from the pipeline, but they are assigned to old-deleted messages.

[ExpandedVenture]

Follow these steps to replicate the issue:

1. create a pipeline
2. deliver connection requests
3. replace the intro message
4. replace the search

The old search remains linked to the deleted message. The planner will create followups to the leads belonging the old search.