When suite.pm in sphinx cannot find Sphinx binaries, it returns silently, without saying a word in the log, so it's difficult to diagnose why the suite isn't run.
It happens when MTR is using default suite list – then sphinx does not make it to the list for no visible reason.
When sphinx is specified explicitly on the list, sphinx tests are at least mentioned as skipped with "No Sphinx" reason.
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Bug
Trivial