Renders the raw standard output of a shell command as plain text with no HTML wrapper.
COMMANDVALUE — set as ReportType in def_report.
def Render(self, Param1="", Param2="", Param3="") -> str:
The query must return at least one row; the first column of the first row is the shell command to execute. Unlike ObjReportCommand, the output is returned as a plain string with no surrounding HTML.
Uses self.system_run() to execute the command.