test: don't complain if an environment variable we don't want doesn't exist
test: don't complain if an environment variable we don't want doesn't exist

nedbat/coveragepy,nedbat/coveragepy,nedbat/coveragepy,hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy,hugovk/coveragepy,nedbat/coveragepy,hugovk/coveragepy,hugovk/coveragepy