RFR: 6846: Parser needs to skip events with no metadata [v4]

[Erik Gahlin]

On Tue, 13 Oct 2020 20:32:24 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Also fixing some javadoc errors.
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Will re-add these later then

Marked as reviewed by egahlin (Reviewer).

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PR: https://git.openjdk.java.net/jmc/pull/128