parallel=True prevents reporting

[nedbat]

1. Create a .coveragerc file with [run]parallel=True

2. Run tests with "coverage run"

3. Combine the data files with "coverage combine"

4. Run "coverage report". Nothing is displayed.

Reported by Ben Bangert

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• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/49

[nedbat]

Fixed in <<changeset cbb794673924 (bb)>>.