Add explicit else-stop to getParamCCP for unknown dataset names

[Copilot]

getParamCCP() had no default branch, so passing an unrecognized data value would silently fall through and produce a confusing "object not found" error at return() rather than a clear failure at the call site.

Change

• Added an else branch that stop()s immediately with an actionable message listing all supported keys:

} else {
  stop(
    "Unknown dataset '", data, "'. ",
    "Supported datasets are: 'TEC', 'Chariou', 'PBMC', 'NSCLC', 'BRCA'."
  )
}

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[phoman14]

Changes Accepted made changes on VSCode