panic: assignment to entry in nil map

goroutine 13 [running]:
github.com/djylb/nps/server.GetDashboardData(0x1)
/go/src/github.com/djylb/nps/server/server.go:1111 +0x2430
github.com/djylb/nps/server.InitDashboardData()
/go/src/github.com/djylb/nps/server/server.go:955 +0x1d
github.com/djylb/nps/server.StartNewServer(0x1f58, 0xc0002924e0, {0x1097e35, 0x3}, 0x3c)
/go/src/github.com/djylb/nps/server/server.go:144 +0x2b6
created by main.run in goroutine 65
/go/src/github.com/djylb/nps/cmd/nps/nps.go:282 +0x817