Fix repo_env crash with empty value #15540
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Hi,
As reported by #15430, --repo_env option is now unable to read from environment variables.
This problem used to be fixed in #12886, but seems to be introduced again in commit c2bdd034014f66ce14529cc353cda18a32320f6c, line 256 and 257 link here where the value put into
repoEnv
is still the original one that might benull
. This commit would revert those changes and put the modified value intorepoEnv
.