Fix uninstall fails with unbound variable on empty passthru array

[thalissonbarbosas]

Summary

• aiwf uninstall (and uninstall-all) crashes on macOS with passthru[@]: unbound variable
• Root cause: bash 3.x (macOS default) raises unbound variable under set -u when expanding an empty array as "${passthru[@]}"
• Fix: use "${passthru[@]+"${passthru[@]}"}" — the ${var+alt} form that expands to nothing when the array is empty

The Problem

cmd_uninstall initialises local passthru=() and then calls:

"$INSTALL_DIR/uninstall.sh" "${passthru[@]}"

With set -euo pipefail at the top of the script, the -u flag causes bash 3.2 (the version shipped with macOS) to treat an empty-array expansion as an unbound variable and abort.

What's Changed

# before
"$INSTALL_DIR/uninstall.sh" "${passthru[@]}"

# after
"$INSTALL_DIR/uninstall.sh" "${passthru[@]+"${passthru[@]}"}"

The ${var+alternate} form only expands when the variable/array is set and non-empty — the standard bash idiom for safely passing optional array arguments under set -u.

Test Plan

• aiwf uninstall runs without error when no extra flags are passed
• aiwf uninstall --purge still forwards --purge correctly to uninstall.sh
• aiwf uninstall-all completes successfully

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