Minor fix to print, set to str (#11934)
* Minor fix to print, set to str
`{commands_filename}` the extra {} actually make it
become a Set, and the output print was like this:
```
Processing json files...
Linking container command to subcommands...
Checking all commands...
Generating {'commands'}.c...
All done, exiting.
```
Introduced in #11920
* more fix
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