[fix] keep one-row metric data when command output is short - #4308

[fix] keep one-row metric data when command output is short#4308

Aias00 merged 2 commits into

apache:masterapache/hertzbeat:masterfrom

orangeCatDeveloper:fix/issue-1560-empty-command-outputorangeCatDeveloper/hertzbeat:fix/issue-1560-empty-command-outputCopy head branch name to clipboard