RFR: 1878: Improve argument check in SKARA CLI [v2]

[Zhao Song]

On Fri, 14 Apr 2023 16:14:46 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> Currently, if a user misuses a command, in some cases, SKARA CLI crashes and throws a stack trace, which is bad and does not provide useful information to the user. 
>> 
>> After investigating, I found that in many places, we don't check whether an option is followed by an argument, and it would trigger some issues.
>> 
>> In this patch, the program would always check the presence of an argument  before attempting to retrieve it for an option.
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update copyright

Thanks for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1502#issuecomment-1511876536