[Forwardport] Ensure DeploymentConfig Reader always returns an array #13792
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Original Pull Request
#13584
Description
When a empty configuration file is ready, this could result in loading invalid configuration, eg. just
1
instead of an array. This will lead to problems with other code, expecting a valid array.Fixed Issues
/pull/13090
Manual testing scenarios
Create an empty file as app/etc/env.php and run the CLI installer