unable to receive untagged metrics

[munkyboy]

looks like commit 9402726 introduced a bug.

this raw metric works:

deploys.test.myservice:1|c#a:b

this does not:

deploys.test.myservice:1|c

stacktrace:

github.com/catkins/statsd-logger/metrics.colorFormatter.formatTags(0x0, 0x0, 0x0, 0x0)
	/go/src/github.com/catkins/statsd-logger/metrics/formatter.go:37 +0x3e9
github.com/catkins/statsd-logger/metrics.colorFormatter.Format(0xc000014040, 0x16, 0xc000014057, 0x3, 0x0, 0x0, 0xc00000a0c0, 0xc00003be48)
	/go/src/github.com/catkins/statsd-logger/metrics/formatter.go:28 +0xd3
github.com/catkins/statsd-logger/metrics.(*server).logMetric(0xc0000100c0, 0xc000014040, 0x16, 0xc000014057, 0x3, 0x0, 0x0)
	/go/src/github.com/catkins/statsd-logger/metrics/server.go:140 +0x99
github.com/catkins/statsd-logger/metrics.(*server).Listen(0xc0000100c0, 0x0, 0x0)
	/go/src/github.com/catkins/statsd-logger/metrics/server.go:118 +0x367
main.main.func1(0x718cc0, 0xc0000100c0)
	/go/src/github.com/catkins/statsd-logger/cmd/statsd-logger/main.go:22 +0x31
created by main.main
	/go/src/github.com/catkins/statsd-logger/cmd/statsd-logger/main.go:21 +0x145