Fix empty external tests

Phil Dawsonrequested to merge
phil/fix-empty-external-tests into master

Description

If the list of external plugin tests is empty, tox -e pyXX-external will fail attempting to move a coverage file which doesn't exist.

Changes proposed in this merge request:

  • If the list of external plugin tests is empty, tox -e pyXX-external will fail attempting to move a coverage file which doesn't exist. Allow the offending mv command to fail.
Edited by Phil Dawson

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