Revert "Warn about commands key missing in tox.ini" #456
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Reverts #407
See #454 and #316
I'd rather fix this to have the following behaviour but at a glance it doesn't seem easy / possible with the current
argvlist
parser (which doesn't differentiate between missing and present-but-empy):commands
: warning (or error)commands
is present but empty: successfully do nothing (no warning).