Fix for when args.path is not used

[michxymi]

With the current implementation of the CCI export_all_versions command you can either pass a config file, a path or a name.

There's currently a bug when not using a path argument. When either the config file or a name is parsed args.path is still used to locate the recipes directory. However because no path has been parsed as an arg it is undefined (i.e None).

This PR adds a check condition to check if args.path is undefined and if it is, it uses the cwd/recipes path, to comply with the expectation that this script should run from the root of a CCI file tree. When a path is indeed requested and args.path is not undefined, its value is used.

[michxymi]

@uilianries Decided to make my first contribution :)

[uilianries]

@michxymi Thank you for your first contribution! 🎉

[AbrilRBS]

Thanks a lot! :)

We're delaying the merge until we do some behind the scenes work on the repo itself, will ping you when ready

[michxymi]

Thanks both. I should have started from this but I also added some unit tests for all the possible args.

[CLAassistant]

All committers have signed the CLA.

[uilianries]

New tests!! ❤️

[AbrilRBS]

This got lost in the sea of other work - thanks to @danimtb for the ping that this was still open :)