fix: allow run command without files for exec and vfolder option

[rjwharry]

This PR Fixes #705

• allow no files when exec and vfolder option is supplied
• run exec_loop function whether files are offered or not

[rapsealk]

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By the way, thanks for the contribution!

[rjwharry]

thank you for your contribute. But the purpose of --exec option is to execute the files, so I think we need to reconsider about the issue.

If the files are mounted with vfolder, then we don't have to upload explicitly. That's why I wanted to allow to use run command without uploading files when --exec and --mount options are enabled simultaneously

[CLAassistant]

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:white_check_mark: achimnol
:x: rjwharry
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[achimnol]

This PR is not in urgency and has no activities for more than half a year. Feel free to post a new, improved PR. Closing this for now.