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Do not be silent if a layer goes missing
When we run some test layers in a subprocess (e.g. when you use zope-testrunner -j2), each subprocess crawls the --test-path to find the tests again. If the --test-path is a relative pathname, and the parent process changes the working directory during the test run, this will cause the child process to fail to find the tests. That is an error, and it shouldn't be silently ignored. This change needs automated tests! I only tested it manually (and my working directory has other uncommitted changes).
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