Provide a better error message when fzf isn't found
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cgaebel commented
When fzf isn't available in the user's PATH, we crash with an ocaml exception. It's a pretty jarring experience for someone who'se never seen one before, and a terrible first impression.
Instead, let's give them a human-readable error message that invites the user to either:
- install fzf, or
- pass -pid to perf