Issue Summary

Due to a bug in initial plan cache loader, notifications on branches work incorrectly if set to "Use the same notification rules as configured for this plan"

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Create a plan with some notification settings
2. Plan branch (does not affect specs branches)
3. Set notifications on the plan branch to "Use the same notification rules as configured for this plan"
4. Restart the server
5. Trigger a branch build that should cause a notification to be sent (e.g. a failed build)

Expected Results

Notifications are send

Actual Results

Plan branch ignores notification rules set on the plan level

Workaround

Make an inconsequential change to plan branch configuration in order to trigger a cache reload.