cli: avoid KeyError when PATH isn't set in environment #5590
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Problem: If PATH is not set in the environment of the flux-run(1) and flux-alloc(1) job submission commands, they raise an unhelpful KeyError and fail to invoke
flux job attach
, leaving the job running without the interactive attach.Do not assume PATH is set in these commands when prepending FLUX_EXEC_PATH.
Fixes #5562