Setting metrics port to null in config.yaml panics

[timsehn]

$ grep -3 metrics config.yaml 

cfg_dir: .doltcfg

metrics:
  host: localhost
  port: null
  labels: {"process": "dolt-sql-server"}

$ dolt sql-server --config=config.yaml
Starting server with Config HP="127.0.0.1:3310"|T="28800000"|R="false"|L="debug"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x101dc3a94]

goroutine 66 [running]:
github.com/dolthub/dolt/go/libraries/doltcore/servercfg.YAMLConfig.MetricsPort(...)
	/Users/timsehn/dolthub/git/dolt/go/libraries/doltcore/servercfg/yaml_config.go:416
github.com/dolthub/dolt/go/cmd/dolt/commands/sqlserver.ConfigureServices.func21({0x103379530?, 0x14000174f50?})
	/Users/timsehn/dolthub/git/dolt/go/cmd/dolt/commands/sqlserver/server.go:454 +0x58
github.com/dolthub/dolt/go/libraries/utils/svcs.AnonService.Init(...)
	/Users/timsehn/dolthub/git/dolt/go/libraries/utils/svcs/controller.go:48
github.com/dolthub/dolt/go/libraries/utils/svcs.(*Controller).Start(0x14000f1a240, {0x103379530, 0x14000174f50})
	/Users/timsehn/dolthub/git/dolt/go/libraries/utils/svcs/controller.go:221 +0x20c
created by github.com/dolthub/dolt/go/cmd/dolt/commands/sqlserver.Serve in goroutine 1
	/Users/timsehn/dolthub/git/dolt/go/cmd/dolt/commands/sqlserver/server.go:91 +0x164

This is especially confusing because the remotesapi.port defaults to null.