[statsdreceiver] fail to parse payloads with empty tag data

[diurnalist]

Component(s)

receiver/statsd

What happened?

Description

sending a statsd payload w/ a completely empty tag causes a panic.

Steps to Reproduce

send a payload like test.metric:42|c|#,,, - note the 0-length strings in between the commas denoting empty tags. dogstatsd clients sometimes are happy to send tags like this; i have mostly seen it in the go client.

Expected Result

no panic, collector is calm and collected

Actual Result

panic

Collector version

v0.96.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/statsd: @jmacd @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• receiver/statsd: @jmacd @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.