[jdk17u-dev] RFR: 8278826: Print error if Shenandoah flags are empty (instead of crashing)

[Aleksey Shipilev]

On Thu, 17 Nov 2022 14:45:23 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to fixes Shenandoah UX problem.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `hotspot_gc_shenandoah`
>  - [x] Ad-hoc CLI tests

Got the push approval.

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PR: https://git.openjdk.org/jdk17u-dev/pull/893