You execute a command or script in a shell terminal and there is no output. An example is:
Some commands or scripts produce no output when there is nothing to provide. This is normal behavior and isn't a concern. If there was output provided, it would either be standard informational output or error output of that command or script.
The above script is used to check if any internal RPMs are missing or modified, and if there are any issues found, the script will ask if you want to repair/fix them. If the script doesn't produce any output, then there are no issues. This generally applies to any command or script. A script generally doesn't provide an output if nothing is reported; the same can be true running a command as well.