Upgrading from 0.4.6 to 0.4.7 causes nil pointer exception

[aas47]

Here's the output snippet.

{"@level":"info","@message":"server now listening for connections","@module":"agent.http_server","@timestamp":"2025-09-19T19:25:37.357644Z","address":"0.0.0.0:27242"}
{"@level":"info","@message":"successfully launched and dispensed plugin","@module":"agent.plugin_manager","@timestamp":"2025-09-19T19:25:37.362530Z","plugin_name":"aws-asg"}
{"@level":"info","@message":"starting workers","@module":"policy_eval","@timestamp":"2025-09-19T19:25:37.362705Z","cluster":10,"horizontal":0}
{"@level":"info","@message":"starting policy source","@module":"policy_manager","@timestamp":"2025-09-19T19:25:37.362833Z","source":"file"}
{"@level":"info","@message":"starting policy source","@module":"policy_manager","@timestamp":"2025-09-19T19:25:37.363608Z","source":"nomad"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x80 pc=0x14ff7e8]

goroutine 16 [running]:
github.com/hashicorp/nomad-autoscaler/policy.(*Manager).monitorPolicies(0x400051a6c0, {0x22b2870, 0x4000173e00}, 0x40001764d0)
	github.com/hashicorp/nomad-autoscaler/policy/manager.go:209 +0x9f8
github.com/hashicorp/nomad-autoscaler/policy.(*Manager).Run(0x400051a6c0, {0x22b2870, 0x4000173e00}, 0x40001764d0)
	github.com/hashicorp/nomad-autoscaler/policy/manager.go:104 +0x164
created by github.com/hashicorp/nomad-autoscaler/agent.(*Agent).Run in goroutine 1
	github.com/hashicorp/nomad-autoscaler/agent/agent.go:82 +0x298

[tristanmorgan]

I think this is related to #1124 but not a "duplicate".
#1125 should fix this one, unfortunately its waiting for the next release.