tests/test-nested-repo.out

run-tests.py: tell coverage.py to ignore errors

Otherwise there'll be some IOErrors when it tries to open python
files created during the execution of e.g. test-hook.

# should print nothing
# should print ? b/x
? b/x
# should print A b/x
A b/x
# should forget b/x
forgetting b/x
# should print nothing