RFR: 8335610: DiagnosticFramework: CmdLine::is_executable() correction

[David Holmes]

On Wed, 3 Jul 2024 13:58:51 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> CmdLine::is_executable() looks wrong, surely an empty line is not executable.
> 
> With this change, in DCmd::parse_and_execute() we will avoid needlessly entering the code block to try and execute the command.
> 
> DCmd tests all good:
> make images test TEST="test/hotspot/jtreg/serviceability/dcmd test/jdk/sun/tools/jcmd"

Can a line ever be empty? If so we should have a test case for that.

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PR Review: https://git.openjdk.org/jdk/pull/20006#pullrequestreview-2157983442