fix: prevent unbound variable error in setup-ralph-loop.sh #17914
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ran into this bug when using ralph-loop - the script crashes with "PROMPT_PARTS[*]: unbound variable" because of set -u strict mode
the fix is just adding :- to provide a default empty string
before: PROMPT="${PROMPT_PARTS[]}"
after: PROMPT="${PROMPT_PARTS[]:-}"
tested locally and it works now