RiboCode - add error handling where the cli tool does not

[JackCurragh]

Add lines to modules ribocode_metaplots and ribocode_ribocode to make the process fail when invalid outputs are created.

PR checklist

• [X] This comment contains a description of changes (with reason).
• [ ] If you've fixed a bug or added code that should be tested, add tests!
• [ ] If you've added a new tool - have you followed the module conventions in the contribution docs
• [ ] If necessary, include test data in your PR.
• [X] Remove all TODO statements.
• [X] Emit the versions.yml file.
• [X] Follow the naming conventions.
• [X] Follow the parameters requirements.
• [X] Follow the input/output options guidelines.
• [X] Add a resource label
• [X] Use BioConda and BioContainers if possible to fulfil software requirements.
• Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
  • For modules:
    • [X] nf-core modules test <MODULE> --profile docker
    • [ ] nf-core modules test <MODULE> --profile singularity
    • [ ] nf-core modules test <MODULE> --profile conda
  • For subworkflows:
    • [ ] nf-core subworkflows test <SUBWORKFLOW> --profile docker
    • [ ] nf-core subworkflows test <SUBWORKFLOW> --profile singularity
    • [ ] nf-core subworkflows test <SUBWORKFLOW> --profile conda