Bug report

package main

import (
	"fmt"

	"github.com/influxdata/telegraf/plugins/parsers"
)

func main() {
	p, _ := parsers.NewInfluxParser()
	m, err := p.Parse([]byte("test,foo=bar v=1i 123456789"))
	fmt.Printf("err=%v\n", err)
	fmt.Printf("m=%#v\n", m)
}

Expected behavior:

err=<nil>
m=[]telegraf.Metric{(*metric.metric)(0xc42009a480)}

Actual behavior:

err=<nil>
m=[]telegraf.Metric{}

Additional info:

It parses fine only if there is a trailing newline.

This is a regression. I noticed this while trying to update PR #2094. Code that was previously working is now failing. While I would argue that a trailing newline should not be required to parse, at the very least if it does not parse, it should return an error.