Show a nice error message when user tries to run a non-existing challenge on an existing track #244
Labels
enhancement
Improves the status quo
:Track Management
New operations, changes in the track format, track download changes and the like
:Usability
Makes Rally easier to use
Milestone
Current behavior
e.g.
esrally --track=percolator --challenge=does-not-exist
just prints[ERROR] Cannot race. This race ended with a fatal crash.
.Desired behavior
We show a clear error message to the user that this challenge does not exist.
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