fix: don't throw when there are no commands - #532
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There's a guard against no inputs in
concurrently/src/concurrently.ts
Line 170 in 4ffe63b
However, there can still a situation where are no commands to run if one of the inputs is a wildcard that doesn't expand to anything.
This has been detected as the cause of #527, though it's not a fix for it.
CompletionListenershould simply assume that no commands = success.